Complex sentence: While it was clearly an evolution of Westland's high winged monoplane designs, it pioneered the use of extruded sections throughout the airframe, something that would be a feature in Petter's future designs.
Split into simpler sentences: While it was clearly an evolution of Westland's high winged monoplane designs. It pioneered the use of extruded sections throughout the airframe, something that would be a feature in Petter's future designs.