How does this script work?

I took this script from one of the capture points in Roblox's pre-made Control Points place template because the place I'm creating has one point to capture. I would like to modify it so I can have only one capture point, which you capture by standing on a block(Not the actual capture point), but before I make any modifications, I would like to know how the script works so I don't screw the script up completly. The script is:

local ControlPoint = script.Parent

wait()      

function WaitForChild(parent, instance)
    while parent:FindFirstChild(instance) == nil do 
        parent.ChildAdded:wait()
    end
    return parent:FindFirstChild(instance)
end 


local RATE = 1/30                                               
local MAX_HEIGHT = 300
local BILLBOARD_STEPS = 50
local TIME_TO_CAPTURE = 10
local POINT_AWARD_RATE = 10                                     

local TeamsService = Game:GetService('Teams')
local PlayersService = Game:GetService('Players')

local EventFeed = WaitForChild(game.Workspace, 'EventFeed')
local AddCustomEvent = WaitForChild(EventFeed, 'AddCustomEvent')
local Zone = WaitForChild(ControlPoint, 'Zone')
local billboard = WaitForChild(Zone, 'BillboardGui')
local ScoreText = WaitForChild(billboard, 'TextLabel')
local pad = WaitForChild(ControlPoint, 'Pad')
WaitForChild(pad,'Mesh')

local PercentControl
local ControllingTeamName
local ControllingTeamColor
local ControllingTeamPlayerCount
local TotalPlayerCount
local PlayersCapturingByTeam

local PlayersCapturingByTeam

local ControlPointName = "a control point"          
local radius = (Zone.Size.x + Zone.Size.z) * 0.25           


local PercentControl = 1

function RayIgnoreCheck(hit)
    if hit then
        if hit.Transparency >= 1 or string.lower(string.gsub(hit.Name,1,6)) == "effect" or hit:IsDescendantOf(ControlPoint) then
            return true
        end
    end
    return false
end

function RayCast(startPos, vec, rayLength)  
    local hitObject, hitPos = game.Workspace:FindPartOnRay(Ray.new(startPos + (vec * .01), vec * rayLength), Handle)
    if hitObject and hitPos then
        local distance = rayLength - (hitPos - startPos).magnitude
        if RayIgnoreCheck(hitObject) and distance > 0 then

            return RayCast(hitPos, vec, distance)
        end
    end
    return hitObject, hitPos
end


local RayHit, RayEnd = RayCast(pad.Position, Vector3.new(0,1,0), 1000)
local height = math.min(MAX_HEIGHT, (pad.Position - RayEnd).magnitude)


local padlight
if ControlPoint:FindFirstChild('Padlight') then
    padlight = ControlPoint.Padlight
else
    padlight = pad:Clone()
end
padlight.Name = 'Padlight'
padlight.CanCollide = false
padlight.Parent = ControlPoint

local highlight
if ControlPoint:FindFirstChild('Highlight') then
    highlight = ControlPoint.Highlight
else
    highlight = pad:Clone()
end
highlight.Name = 'Highlight'
highlight.CanCollide = false
highlight.Transparency = .75
highlight.Mesh.Offset = Vector3.new(0, height*.5, 0)
highlight.Parent = ControlPoint

pad.BrickColor = BrickColor.new("Institutional white")
billboard.Enabled = false

local function ResizeHighlight(PercentControl, height)
    padlight.Mesh.Scale = pad.Mesh.Scale * Vector3.new(PercentControl, 1, PercentControl) * 1.01
    highlight.Mesh.Scale = pad.Mesh.Scale * Vector3.new(PercentControl, height * (1 / highlight.Size.y), PercentControl)
end

ResizeHighlight(PercentControl, height)


Spawn(function()        
    while true do
        wait(POINT_AWARD_RATE)
        local AwardTeam = nil
        for _, CheckTeam in ipairs(TeamsService:GetTeams()) do
            if CheckTeam.TeamColor == padlight.BrickColor then
                CheckTeam.Score = CheckTeam.Score + 1
                ScoreText.TextColor3 = padlight.BrickColor.Color
                Spawn(function()
                    ScoreText.TextStrokeTransparency = 0
                    ScoreText.TextTransparency = 0
                    billboard.StudsOffset = Vector3.new(0, 5, 0)
                    billboard.Enabled=true
                    for i = 1, BILLBOARD_STEPS do
                        wait(RATE)
                        local percent = i / BILLBOARD_STEPS
                        billboard.StudsOffset = Vector3.new(0, 5 + (percent * 5), 0)
                        ScoreText.TextStrokeTransparency = percent
                        ScoreText.TextTransparency = percent
                    end
                    billboard.Enabled=false
                end)
            end
        end
    end
end)
------------------------------------------------------

local function IsPlayerWithinCaptureRadius(player, capturePosition, captureRadius)
    if player and player.Character ~= nil then
        local torso = player.Character:FindFirstChild('Torso')
        local humanoid = player.Character:FindFirstChild('Humanoid')
        if torso ~= nil and humanoid~=nil and humanoid.Health > 0 then
            return torso.Position.y > capturePosition.y and (torso.Position - capturePosition).magnitude < radius
        end
    end
    return false
end

local function FindTeam(color)
    for _, team in ipairs(PlayersCapturingByTeam) do
        if team.color == color then
            return team
        end
    end
    local team = {color = color, players = {}}
    table.insert(PlayersCapturingByTeam,team)
    return team
end



while true do
    wait(RATE)

    PlayersCapturingByTeam = {}
    for _, player in ipairs(PlayersService:GetPlayers()) do
        if IsPlayerWithinCaptureRadius(player, Zone.Position, radius + 2) then
            local team = FindTeam(player.TeamColor)
            table.insert(team.players, player.Name)
        end
    end

    ControllingTeamColor = BrickColor.new('Medium stone grey')      
    ControllingTeamPlayerCount = 0
    TotalPlayerCount = 0
    for _, team in ipairs(PlayersCapturingByTeam) do
        TotalPlayerCount = TotalPlayerCount + #team.players
        if #team.players > ControllingTeamPlayerCount then
            ControllingTeamColor = team.color
            ControllingTeamPlayerCount = #team.players
        end
    end

    if TotalPlayerCount >= 1 then
        local influence = ControllingTeamPlayerCount - (TotalPlayerCount - ControllingTeamPlayerCount)
        if influence >= 1 then
            if padlight.BrickColor == ControllingTeamColor then
                if PercentControl < 1 then
                    PercentControl = PercentControl + ((RATE / TIME_TO_CAPTURE) * influence)
                end
            else
                PercentControl = PercentControl - ((RATE / TIME_TO_CAPTURE) * influence)
            end
            if PercentControl > 1 then
                PercentControl = 1
            elseif PercentControl < 0 then      --Take over
                padlight.BrickColor = ControllingTeamColor
                highlight.BrickColor = ControllingTeamColor
                PercentControl = 0
                ControllingTeamName = ""
                for _, team in ipairs(TeamsService:GetTeams()) do
                    if team.TeamColor == ControllingTeamColor then
                        ControllingTeamName = team.Name .. "#"
                    end
                end
                if ControllingTeamName ~= "" then
                    AddCustomEvent:Invoke(ControllingTeamName,'['..tostring(ControllingTeamColor.Number)..']'," captured "..ControlPointName.."!")
                else
                    AddCustomEvent:Invoke(ControlPointName.." has been captured!")
                end
            end
            ResizeHighlight(PercentControl, height)
        end
    end
end