Complex sentence: Kuttelwascher joined the Czechoslovak Air Force in 1937, became a pilot, served with the 44th Fighter Unit, and then with the 32nd Fighter Unit based at Hradec Králové in northern Bohemia.
Split into simpler sentences: Kuttelwascher joined the Czechoslovak Air Force in 1937 and became a pilot. He served with the 44th Fighter Unit, and then with the 32nd Fighter Unit based at Hradec Králové in northern Bohemia.