Simplify the following text for a Grade 11 native English-speaking person.
Original: It is a member of the family Alvarezsauridae , small coelurosaurian dinosaurs which are characterized by short but powerful forelimbs specialized for digging .
Simplified: It is a member of the family Alvarezsauridae , small coelurosaurian dinosaurs which have short but powerful forelimbs specialized for digging .