Complex sentence: Compared with most autogyros of its time it had a very advanced appearance, with a sleek, streamlined fuselage, a central, air-cooled engine and a rotor on a narrow, carefully faired pylon.
Split into simpler sentences: Compared with most autogyros of its time it had a very advanced appearance. It had a sleek, streamlined fuselage with a central, air-cooled engine and a rotor on a narrow, carefully faired pylon.