Complex sentence: A swept wing is a wing planform favored for high subsonic and supersonic speeds, and is found on almost all jet aircraft in one form or another, as well as some high speed propeller aircraft.
Split into simpler sentences: A swept wing is a wing planform favored for high subsonic and supersonic speeds. They are commonly used on jet aircraft which were designed to fly at near-sonic speeds, as well as some high speed propeller aircraft.