Complex sentence: The original air-breathing gas turbine jet engine was the turbojet, which compresses and heats air and then exhausts it as a high speed, high temperature jet to create thrust.
Split into simpler sentences: The original air-breathing gas turbine jet engine was the turbojet. Designed by two engineers, Frank Whittle in England United Kingdom and Hans von Ohain in Germany Compresses and heats air and then exhausts it as a high speed, high temperature jet to create thrust.