Complex sentence: The British trainer requirement had been more demanding, requiring supersonic performance and superior avionics; as a result, the Br.121 needed a thinner wing, increased weapon load and more power, the latter to meet the RAF's required ferry range of.
Split into simpler sentences: The British trainer requirement was the most demanding, requiring supersonic performance and superior avionics. As a result, the Br.121 needed a thinner wing, increased weapons load, and more power-the latter to meet the RAF's required ferry range of.