Complex sentence: In 1961, he became Controller of the Navy and in 1965 Joint Commander of the three services in the Middle East during the evacuation of British Nationals during the Aden Emergency.
Split into simpler sentences: In 1961, he became Controller of the Navy and in 1965 Commander-in-Chief, Middle East. In that role he served as Joint Commander of the three services in the Middle East during the evacuation of British Nationals during the Aden Emergency.