Simplify the following text for a Grade 14 native English-speaking person.
Original: Alvarezsaurus was featured in the Discovery Channel television series Dinosaur Planet , which speculated that it was a predator of young Saltasaurus , although these species did not exist at the same time , Alvarezsaurus being about 5 million years older than Saltasaurus .
Simplified: Alvarezsaurus was featured in the Discovery Channel television series Dinosaur Planet , which speculated that it was a predator of young Saltasaurus , though these species did not exist at the same time , Alvarezsaurus being about 5 million years older than Saltasaurus .