Complex sentence: A "Carnotaurus" ambushes and chases an infant "Parasaurolophus" and the stampede of the dinosaurs that force an "Iguanodon" mother to abandon her nest.
Split into simpler sentences: A "Carnotaurus" ambushes an infant "Parasaurolophus". The resulting stampede of the dinosaurs forces an "Iguanodon" mother to abandon her nest.