Complex sentence: On 19 July 2013, Airbus delivered the 1000th A330 to Cathay Pacific, making it the first Airbus wide-body airliner to achieve 1000 deliveries, and the fourth overall to pass the milestone after the Boeing 747,767 and 777.
Split into simpler sentences: On 19 July 2013, Airbus delivered the 1000th A330 to Cathay Pacific. It is the first Airbus widebody airliner to achieve 1000 deliveries, and the fourth overall to achieve the milestone after the Boeing 747,767 and 777.