Complex sentence: In January 1974, he was appointed a Personal Aide-de-Camp to Queen Elizabeth II. Phillips was substantively promoted to Captain in July 1975, and retired from the Army on 30 March 1978.
Split into simpler sentences: In January 1974, Phillips was appointed a Personal Aide-de-Camp to Queen Elizabeth II. Phillips was substantively promoted to Captain in July 1975. Phillips retired from the Army on 30 March 1978.