Complex sentence: His writing career began in the Royal Air Force during World War II for troop shows following which, he wrote material for comedian Dick Bentley, before meeting Frank Muir, who wrote for Jimmy Edwards in 1947.
Split into simpler sentences: His writing career began in the Royal Air Force during World War II, when he wrote for troop shows. Subsequently he wrote material for comedian Dick Bentley, before meeting Frank Muir (who wrote for Jimmy Edwards) in 1947.