Complex sentence: One is a teenage girl named Sarah Lemon, who has decided to commit suicide after her parents divorced and after the boy she liked and believed to have loved her began making advances on her and ended up rejecting and humiliating her.
Split into simpler sentences: One is a teenage girl named Sarah Lemon, who has decided to commit suicide after her parents divorced. Additionally, after the boy she liked began making advances on her she believed he loved her, but he ended up rejecting and humiliating her.