Complex sentence: He was Flag Officer, Helicopter Group during Operation Musketeer, the assault on Port Said during the Suez crisis, in 1956 and became Admiral commanding the Reserve Fleet in 1958 before retiring in 1959.
Split into simpler sentences: He was Flag Officer, Helicopter Group during Operation Musketeer, the assault on Port Said during the Suez crisis, in 1956. He became Admiral commanding the Reserve Fleet in 1958 before retiring in 1959.