Complex sentence: First produced in the late 1940s, it powered the first Vickers Viscount maiden flight in 1948, and was still in production until the last F27s and H.S 748s were produced in 1987.
Split into simpler sentences: First produced in the late 1940s, it powered the first Vickers Viscount maiden flight in 1948. The Dart was still in production until the last F27s and H.S 748s were produced in 1987.