Complex sentence: Pholadidae, known as piddocks or angelwings, are a family of bivalve mollusc similar to a clam; however, they are unique in that each side of their shells is divided into 2 or 3 separate sections.
Split into simpler sentences: Pholadidae, known as piddocks or angelwings, are a family of bivalve mollusc similar to a clam. Pidocks are unique in that each side of their shells is divided into 2 or 3 separate sections.