Original sentence: In the 90's,the company was owned by Gordon & Gotch, followed by the purchase by Brashs who merged Bookworld with A&R.Ownership of the company changed several times since the 1971s.Ownership of the company then passed on to Whitecouls which was itself later purchased by W H Smith in 2001
Edited sentence: In the 1990s, the company was owned by Gordon & Gotch, followed by the purchase by Brashs who merged Bookworld with A&R.Ownership of the company has changed several times since the 1970s.Ownership of the company then passed on to Whitcoull's which was itself later purchased by W H Smith in 2001