Complex sentence: The Mixe noun does not normally inflect, only animate human nouns inflect for plural, but compound nouns are common, and a lot of derivational morphology allows for creation of new nouns with different meanings both from verbs and other nouns.
Split into simpler sentences: The Mixe noun does not normally inflect, except that human nouns inflect for plural. Noun compounding is a very productive process, and the profuse derivational morphology allows for creation of new nouns both from verbs and other nouns.