Complex sentence: It was a member of the extinct order of Multituberculata within the Suborder of Cimolodonta, and possibly the family Cimolodontidae.
Split into simpler sentences: It was a member of the extinct order of Multituberculata. For those of a technical inclination, it's within the Suborder of Cimolodonta, and possibly the family Cimolodontidae.