Complex sentence: On 18 December 1791 left Port Jackson taking home the last company of the New South Wales Marines Those leaving included Robert Ross, Watkin Tench, William Dawes, and Ralph Clark.
Split into simpler sentences: On 18 December 1791 left Port Jackson taking home the last company of the New South Wales Marine Corps. The marines leaving included Robert Ross, Watkin Tench, William Dawes, and Ralph Clark.