Complex sentence: In the case of the toxic moth "Utetheisa ornatrix", the spermatophore includes sperm, nutrients, and pyrrolizidine alkaloids (PA) which prevent predation because it is poisonous to most organisms.
Split into simpler sentences: In the case of the toxic moth "Utetheisa ornatrix", the spermatophore includes sperm, nutrients, and pyrrolizidine alkaloids (PA). PA plays an important role in preventing predation in "Utetheisa ornatrix" because it is poisonous to most organisms.