What do I use to repair a rod that is broken where the 2 parts of the rod come together? 

Need more description of the failure, but if the female ferrule has failed, you should be able to use structural epoxy to put all the parts back together, (an internal spigot or external sleeve will add to the strength)  then wrap the full length and about a half inch on each end more, then finish with wrap epoxy.  

But with other failures, need more info.

20 hours ago, MickD said:

Need more description of the failure, but if the female ferrule has failed, you should be able to use structural epoxy to put all the parts back together, (an internal spigot or external sleeve will add to the strength)  then wrap the full length and about a half inch on each end more, then finish with wrap epoxy.  

But with other failures, need more info.

Its both sides, about 6, 3 inch long "shreads" or broken strips that i'd need to fix. Should I buy rod parts for there and make the rod a 1 piece and glue it together?

It's toast, move on.

I agree that with that degree of destruction, the rod cannot be repaired to anything like its former self.  And it most likely will fail again.  Don't throw it away because the blank sections can be used for sleeves to repair less severe rod failures. 

http://www.rodbuilding.org/library/repair-oquinn.html