Complex sentence: Some were later adapted for use in the Chesapeake Bay Menhaden fishery during the 1970s and 80s, and a few are still being used as commercial fishing vessels to work pound nets in the chesapeake Bay, and to harvest clams in the Atlantic ocean off Cape May.
Split into simpler sentences: Some were later adapted for use in the Chesapeake Bay Menhaden fishery during the 1970s and 80s. The few boats of this type that are still being used as commercial fishing vessels are used in the Chesapeake Bay pound net fishery and to harvest clams in the Atlantic ocean off Cape May.