Complex sentence: He became commander-in-chief of the Mediterranean Fleet in August 1695 and then returned to England in April 1696; promoted to Admiral of the Fleet on his return he commanded the Channel Fleet until the Treaty of Ryswick in September 1697.
Split into simpler sentences: He became commander-in-chief of the Mediterranean Fleet in August 1695 and then returned to England in April 1696. Promoted to Admiral of the Fleet shortly afterwards, he commanded the Channel Fleet until the Treaty of Ryswick in September 1697.