Complex sentence: By the end of February 2009 Rolls-Royce had secured orders for engines to power a total of 420 A350 aircraft, and by November this figure was up to 500 aircraft.
Split into simpler sentences: By the end of February 2009, Rolls-Royce had secured orders for engines to power a total of 420 A350 aircraft. By November this figure was up to 500 aircraft.