Complex sentence: To get over this, it worked jointly with Newman College, a Roman Catholic teachers training college on a separate campus about two miles away, but full joint-working was not acceptable to the Roman Catholic hierarchy and the collaboration ended after 1992.
Split into simpler sentences: To get over this, it worked jointly with Newman College, a Roman Catholic teachers training college on a separate campus about two miles away. But full joint working was not acceptable to the Roman Catholic hierarchy and the collaboration ended after 1992.