"make that it has 2 animations that change between each other, and make it even more complex and long"

-- server script 
local Players = game:GetService("Players")

Players.PlayerAdded:Connect(function(player)
    local character = player.CharacterAdded:Wait()
    local humanoid = character:WaitForChild("Humanoid")
    local animation1 = Instance.new("Animation")
    local animation2 = Instance.new("Animation")
    animation1.AnimationId = "http://www.roblox.com/Asset?ID=125324327" -- Replace with your punch animation ID
    animation2.AnimationId = "http://www.roblox.com/Asset?ID=125324328" -- Replace with your kick animation ID
    local animationTrack1 = humanoid:LoadAnimation(animation1)
    local animationTrack2 = humanoid:LoadAnimation(animation2)
    
    player.Chatted:Connect(function(msg)
        if msg:lower() == "punch" then
            animationTrack1:Play()
            wait(2) -- wait for 2 seconds
            animationTrack1:Stop()
            animationTrack2:Play()
        end
    end)
end)

-- local script 
local player = game.Players.LocalPlayer
local UserInputService = game:GetService("UserInputService")

UserInputService.InputBegan:Connect(function(input)
    if input.KeyCode == Enum.KeyCode.E then -- Change to your desired key
        player:Say("punch")
    end
end)