Complex sentence: To comply with the new regulations Jaguar produced an all-new car; the XJR-14, which was designed by John Piper under the design direction of Ross Brawn and built by Tom Walkinshaw Racing (TWR).
Split into simpler sentences: To comply with the new regulations Jaguar produced an all-new car, the XJR-14. It was designed by John Piper under the design direction of Ross Brawn and was built by Tom Walkinshaw Racing (TWR).