Complex sentence: He was further promoted to vice-admiral of the blue in 1775 and vice-admiral of the red in 1778 before becoming second in command of the Channel Fleet and fighting at the Battle of Ushant on 27 July 1778.
Split into simpler sentences: He was further promoted to vice-admiral of the blue in 1775 and vice-admiral of the red in 1778. He became second in command of the Channel Fleet and fought at the Battle of Ushant on 27 July 1778.