Complex sentence: Ann slaughtered the six main members of the clique, who never showed up for her birthday party, expressly for the purpose of framing Ginny who suddenly breaks free, takes Ann's knife and kills her with it.
Split into simpler sentences: Ann slaughtered the six main members of the clique who never showed up for her birthday party. Expressly for the purpose of framing Ginny who suddenly breaks free, takes Ann's knife and kills her with it.