Complex sentence: The Williams X-Jet, created by Williams International, was a small, light-weight Vertical Take Off and Landing (VTOL) system powered by a modified Williams F107 turbofan engine.
Split into simpler sentences: The Williams X-Jet, created by Williams International, is a small, light-weight Vertical Take Off and Landing (VTOL) system. It is powered by a modified Williams F107 turbofan engine.