Complex sentence: Mark plays a tape showing Jesse and Rachel having sex, making Rachel believe Jesse never cared for her.Rachel becomes bloodthirsty and her ability is triggered; she closes the doors of the house and kills most of the partiers.
Split into simpler sentences: Mark plays a tape showing Jesse and Rachel having sex, making Rachel believe Jesse never cared for her. Rachel's ability is triggered; she closes the doors of the house and kills most of the partiers.