why did CCR break up?

I'm 15, so I dont know anything about the breakup of CCR. I asked my mom and dad, but even they weren't sure. I asked my mom, "well, can john fogerty still play his CCR songs or not?" (i was asking b/c he was had a concert here where i live not to long ago). And she said she doesn't know because of some lawsuit??? Was the breakup that bad???? Or was she exaggerating? It'd help a lot if you can sum up why they broke up, and if john fogerty can ever play CCR songs in his solo career, oh, and also, if there will ever be a reunion.