Complex sentence: Dacres was promoted to commander on 10 March 1795 in the 14-gun sloop On 31 October he was appointed post captain on the 20-gun, which formed part of Richard Strachan's squadron in the English Channel.
Split into simpler sentences: Dacres was promoted to commander on 10 March 1795, and then to post-captain on 31 October 1795. He was then appointed to command the 20-gun, which formed part of Richard Strachan's squadron in the English Channel.