Complex sentence: Before their marriage she was a bit promiscuous she once stole a boyfriend away from Hera and because of that Hera placed a curse on her son Cupid in "The Green-Eyed Monster".
Split into simpler sentences: Before their marriage she was a bit promiscuous she once stole a boyfriend away from Hera. And because of that Hera placed a curse on her son Cupid in "The Green-Eyed Monster".