Complex sentence: Although flaps were included late in the design stage, the wing remained unaltered; as a result, the Whitley flew with a pronounced nose-down attitude when flown with the wings in the cruising position, resulting in considerable drag.
Split into simpler sentences: Although flaps were included late in the design stage, the wing remained unaltered. As a result, the Whitley flew with a pronounced nose-down attitude, resulting in considerable drag.