Complex sentence: He served as editor of "Opera" magazine from 1950 to 1953 and as director of the Royal Opera House, Covent Garden from 1951 to 1953 and again from 1969 to 1972.
Split into simpler sentences: He served as editor of "Opera" magazine from 1950 to 1953. He was director of the Royal Opera House, Covent Garden from 1951 to 1953 and again from 1969 to 1972.