Complex sentence: The first Unitas possessed an open trap but Twyford was eager to remedy this and commissioned his best potters to produce a free-standing water closet that had a lid to the trap and was made completely of earthenware.
Split into simpler sentences: The first Unitas possessed an open trap but Twyford was eager to remedy this. He commissioned his best potters to produce a free-standing water closet that had a lid to the trap and was made completely of earthenware.