Complex sentence: Gastropod taxonomy is in flux currently, because of new information coming from molecular phylogeny (DNA studies) and because of this, many groups are being moved around and radically revised, especially in the order Patellogastropoda, the true limpets.
Split into simpler sentences: Gastropod taxonomy is in flux currently, because of new information coming from molecular phylogeny (DNA studies). Because of this, many groups are being moved around and radically revised, especially in the order Patellogastropoda, the true limpets.