Complex sentence: Heidi visits Cartman to apologize and complete their break-up, but Cartman decides to tell her more information, which results in Heidi blaming Kyle for manipulating her because he's a' dirty Jew' and breaks up with him, returning to Cartman again.
Split into simpler sentences: Heidi visits Cartman to apologize and complete their break-up, but Cartman decides to tell her more information. Soon afterwards, Heidi blames Kyle for manipulating her and breaks up with him, returning to Cartman again.