Complex sentence: Dinosauromorpha contains more basal forms, including "Lagerpeton" and "Marasuchus", as well as more derived forms, including dinosaurs; birds, according to most modern scientists, belong to the latter as members of the theropods.
Split into simpler sentences: Dinosauromorpha contains more basal forms, including "Lagerpeton" and "Marasuchus", as well as more derived forms, including dinosaurs. Birds, according to most modern scientists, belong to the latter as members of the theropods.