Original sentence: The Open University produced supporting material on its website.The region 2 DVD of the full 60-minute documentary was released through 2 Entertain on 2 March 2009
Edited sentence: The Open University has produced supporting material on its website.The region 2 DVD has been released by 2 Entertain on 2 March 2009 (BBCDVD2938) containing the full 60-minute documentary