Complex sentence: After further ground trials Cody finally judged conditions suitable for a flight trial on 16 October, and made the first recognised powered and sustained flight in the United Kingdom, which flight covered only 1,390 ft (424 m).
Split into simpler sentences: After further ground trials Cody finally judged conditions suitable for a flight trial on 16 October, and made the first recognised powered and sustained flight in the United Kingdom. The first flight covered only 1,390 ft (424 m).