Complex sentence: He became chief of staff to Sir Charles Madden, commanding the 1st Battle Squadron in November 1916 and was appointed director of torpedoes and mines at the Admiralty in June 1918.
Split into simpler sentences: He became chief of staff to Sir Charles Madden, commanding the 1st Battle Squadron in November 1916. He was appointed director of torpedoes and mines at the Admiralty in June 1918.