Original sentence: In general, executive cars are 4-door notchback saloons, though many are also available as spacious estates.Some manufacturers seek to differentiate their offerings by fitting them with a 4-door fastback, 5-door liftback or hatchback body - in particular Saab, Citroën and Renault have been known to prefer such body styles, with Rover and Ford also offering such models through the 1990s.The definitive British executive cars of the 1960s and 1970s though remain the Rover P6 range, superseded by the modern SD1, and the Jaguar XJ6
Edited sentence: In general, executive cars are 4-door saloons, though many are also available as spacious estates.Some manufacturers seek to differentiate their offerings by fitting them with a 4-door fastback, 5-door liftback or hatchback body - in particular Citroën and Renault have been known to prefer such body styles, with Rover also offering non-saloon executive models from the 1970s through 1990s.The definitive British executive cars of the 1960s and 1970s though remain the Rover P6 range, superseded by the astonishingly modern SD1, and the Jaguar XJ6