Complex sentence: The Super Cruiser was more popular than the basic J-5A, and in 1947, two PA-12s flew around the world, and the worst mechanical failure they suffered was a cracked tailwheel.
Split into simpler sentences: The Super Cruiser was more popular than the basic J-5A. In 1947, two PA-12s flew around the world, and the worst mechanical failure they suffered was a cracked tailwheel.