Complex sentence: It was a member of the extinct order of Multituberculata, and it lies within the suborder of Cimolodonta, family Neoplagiaulacidae.
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, family Neoplagiaulacidae.