Complex sentence: Invented by the Spanish engineer Juan de la Cierva to create an aircraft that could safely fly at slow speeds, the autogyro was first flown on 9 January 1923, at Cuatro Vientos Airfield in Madrid.
Split into simpler sentences: Invented by the Spanish engineer Juan de la Cierva to create an aircraft that could safely fly at slow speeds. The autogyro was first flown on 9 January 1923, at Cuatro Vientos Airfield in Madrid.