How can I show the leader's health of each team and make it say the other team won

I'm making a Minecraft mini-game called "Clan Wars". You have to try to kill the other team's leader then you team wins! The problem is I would like the scoreboard to show the leaders' health and under both leaders' health, show all the players and the team they are on. When the leader is dead on the red side, for example, it says blue won and teleports all the players back to the lobby. If you need more information, comment below and I will edit those details in soon!

{I would rather it not be a pressure plate because a player can still activate it}

I have tried looking up testfor commands to do something like [testfor entity=ocelot x z y] but it doesn't work