Complex sentence: The Piel CP-40 Donald is a French homebuilt single engine, single seat, high wing aircraft, first flown in the early 1950s, though the last of the three examples completed did not fly until almost forty years later.
Split into simpler sentences: The Piel CP-40 Donald is a French homebuilt, single engine, single seat, high wing aircraft. It was first flown in the early 1950s, though the last of the three examples completed did not fly until almost forty years later.