Complex sentence: A multiple sequence alignment of 20 orthologous protein sequences revealed very strong conservation of the polysaccharide biosynthesis domain but conservation decreased greatly after the polysaccharide biosynthesis domain, and was esentially non-existent in further related invertebrates.
Split into simpler sentences: A multiple sequence alignment of 20 orthologous protein sequences revealed very strong conservation of the polysaccharide biosynthesis domain but conservation decreased greatly after it. Conservation of the protein sequence after the conserved domain was esentially non-existent in further related invertebrates.