Complex sentence: A large number of dinosaur species can be found here, including relatives of "Camarasaurus" such as "Diplodocus", "Apatosaurus" and "Brachiosaurus"; but camarasaurs are the most abundant of the dinosaurs in the formation.
Split into simpler sentences: A large number of dinosaur species can be found here, including relatives of the "Camarasaurus" such as "Diplodocus", "Apatosaurus" and "Brachiosaurus". However, camarasaurs are the most abundant of all the dinosaurs in the formation.