Complex sentence: Trionyx messelianus is a three-clawed soft-shell turtle that can reach a length of about two feet and it is the largest species of turtles of Messel Pit Fossil Site.
Split into simpler sentences: Trionyx messelianus is a three-clawed soft-shell turtle that can reach a length of about two feet. It is the largest species of turtles of Messel Pit Fossil Site.