Simplify the following text for a Grade 14 native English-speaking person.
Original: Relationships within the family are poorly understood , but Adasaurus seems to be a member of the subfamily Dromaeosaurinae , along with the Mongolian Achillobator and several North American species , including Utahraptor and Dromaeosaurus , after which the whole family is named .
Simplified: Relationships within the family are poorly understood , but Adasaurus seems to be a member of the subfamily Dromaeosaurinae , along with the Mongolian Achillobator and several North American species .