Simplify the following text for a Grade 12 native English-speaking person.
Original: Paleontologists believe Eoraptor resembles the common ancestor of all dinosaurs ; if this is true , its traits suggest that the first dinosaurs were small , bipedal predators .
Simplified: Eoraptor probably resembles the common ancestor of all dinosaurs ; its traits suggest that the first dinosaurs were small , bipedal predators .