Complex sentence: This family originated from the Myophoriidae in the Triassic and underwent an explosion of diversity in the Jurassic, reaching an acme in the Cretaceous, although most genera became extinct at the end of this period.
Split into simpler sentences: This family originated from the Myophoriidae in the Triassic. The family underwent an explosion of diversity in the Jurassic, reaching an maximum of diversity in the Cretaceous, although most genera became extinct at the end of this period.