Simplify the following text for a Grade 11 native English-speaking person.
Original: In this environment , it was an apex predator at the top of the food chain , probably preying on other large dinosaurs like the hadrosaur Saurolophus or the sauropod Nemegtosaurus .
Simplified: In this environment , it was a predator at the top of the food chain , probably preying on other large dinosaurs like the hadrosaur Saurolophus or the sauropod Nemegtosaurus .