Complex sentence: In the 1940s, the British aircraft designer John Carver Meadows Frost developed the tailless jet-powered research aircraft called the DH108 "Swallow", based on the forward fuselage of the de Havilland Vampire jet fighter.
Split into simpler sentences: In the 1940s, the British aircraft designer John Carver Meadows Frost developed the tailless jet-powered research aircraft called the de Havilland DH.108 "Swallow". Built using the forward fuselage of the de Havilland Vampire jet fighter.