Complex sentence: The flea beetle is a small, jumping beetle of the leaf beetle family (Chrysomelidae), that makes up the tribe Alticini, which is a part of the subfamily Galerucinae, though they were historically classified as a subfamily in their own right.
Split into simpler sentences: The flea beetle is a small, jumping beetle of the leaf beetle family (Chrysomelidae). They make up the tribe Alticini, which is a part of the subfamily Galerucinae, though they were historically classified as a subfamily in their own right.