Complex sentence: The first ferry deliveries of North American-built aircraft ordered by the RAF began on 10 November 1940 when, taking off from Gander with RAF Aldergrove as his destination, Don Bennett led and navigated a formation of seven Lockheed Hudson Mk.III's.
Split into simpler sentences: The first ferry deliveries of North American-built aircraft ordered by the RAF occurred in November 1940. An operation began on 10th November when, taking off from Gander with RAF Aldergrove as his destination, Don Bennett led and navigated a formation flight of seven Lockheed Hudson Mk.III's.