Complex sentence: The de Havilland DH.103 Hornet was a twin-piston engined fighter aircraft developed by de Havilland; the aircraft further exploited the wooden construction techniques that had been pioneered by the earlier de Havilland Mosquito.
Split into simpler sentences: The de Havilland DH.103 Hornet was a twin-piston engined fighter aircraft developed by de Havilland. It further exploited the wooden construction techniques that had been pioneered by the earlier de Havilland Mosquito.