Complex sentence: He served as an assistant United States Attorney of the District of Maryland from 1953 to 1955, and was himself the United States Attorney for the District of Maryland from 1956 to 1957.
Split into simpler sentences: He served as an assistant United States Attorney of the District of Maryland from 1953 to 1955, and was himself the. He was a United States Attorney for the District of Maryland from 1956 to 1957.