Complex sentence: Farallen senses danger nearby, and an angry Allosaurus arrives and you help Farallen shout out warnings by roaring until the Allosaurus arrives and got driven him by Farallen.
Split into simpler sentences: Farallen senses danger nearby, and an angry Allosaurus arrives. You help Farallen shout out warnings by roaring until the Allosaurus arrives and got driven away by Farallen.