Complex sentence: The General Electric TF39 is a high-bypass turbofan engine, developed to power the Lockheed C-5 Galaxy, it was the first high-power, high-bypass jet engine available.
Split into simpler sentences: The General Electric TF39 is a high-bypass turbofan engine. Developed to power the Lockheed C-5 Galaxy, it was the first high-power, high-bypass jet engine available.