Original sentence: It has sometimes been described as the world's first superbike, but that term has never been accurately defined, except in some racing categories.The Z1, along with Honda's CB750 from 1969, introduced the four-cylinder, across the frame, disc-braked layout to a wider public
Edited sentence: It has been described as the world's first superbike, but that term is probably more accurately applied to the BSA Rocket 3.The Z1, along with Honda's CB750, introduced the four-cylinder, across the frame, disc-braked layout