Complex sentence: In January 1807 Master Commandant Charles Gordon was appointed "Chesapeake" s commanding officer (Captain) and ordered to prepare her for patrol and convoy duty in the Mediterranean to relieve her sister ship which had been on duty there since 1803.
Split into simpler sentences: In January 1807 Master Commandant Charles Gordon was appointed "Chesapeake" s commanding officer (Captain). He was ordered to prepare her for patrol and convoy duty in the Mediterranean to relieve her sister ship, which had been on duty there since 1803.