Complex sentence: The terminal was to be managed by F.C. Bennett, but in the event was only operational for 13 years; diminishing rail traffic had led the Rover Group (which had taken over Mini production) to acquire the site for further expansion.
Split into simpler sentences: The terminal was to be managed by F.C. Bennett, but in the event was only operational for 13 years. Diminishing rail traffic led the Rover Group (which had taken over Mini production) to acquire the site for further expansion.