Complex sentence: Fertility rites are religious rituals that reenact, either actually or symbolically, sexual acts and/or reproductive processes, or which may involve the sacrifice of'a primal animal, which must be sacrificed in the cause of fertility or even creation'.
Split into simpler sentences: Fertility rites are religious rituals that reenact, either actually or symbolically, sexual acts and/or reproductive processes. They may alternatively involve the sacrifice of'a primal animal, which must be sacrificed in the cause of fertility or even creation'.