Original: Sargent was chief conductor of the Proms from 1948 until his death in 1967 and of the BBC Symphony Orchestra from 1950 to 1957, succeeding Sir Adrian Boult.
Simplified: The Proms and later years Sargent was chief conductor of the Proms from 1948 until his death in 1967. In 1950 he followed Sir Adrian Boult as conductor of the BBC Symphony Orchestra.