Divi up units on player leave?

Hey, I have another question, being that this website holds much skill, I've been messing around and trying to figure out how to create a trigger to divide up all units owned by a player when they leave, I'm close to clueless on the abouts of doing this, however I did come up with an array of the players and I attempted to divide the units of player 1(for example) among players 2 through 5 (for example) but I can't figure out how to divide those units of player 1 evenly among 2-5, if anyone could help I'd once again greatly appreciate your time spent, thank you.

add all of the leaving player's units to a unit group then use a loop 1-12 and do
If player slot status = in game or whatever then
pick random unit in leaving players unit and change its owner to player(forloopindexa)
else
do nothing