Complex sentence: Based upon designs produced by Power Jets, Rolls-Royce produced more advanced and powerful turbojet engines for the Gloster, beyond improvements to the Welland engine, the Rolls-Royce Derwent engine adopted upon later marks of Meteors led to considerable performance increases.
Split into simpler sentences: Based upon designs produced by Power Jets, Rolls-Royce produced more advanced and powerful turbojet engines. Beyond improvements to the Welland engine, the Rolls-Royce Derwent engine adopted upon later marks of Meteors led to considerable performance increases.