Complex sentence: In 1365, Bishop Adam Houghton and John of Gaunt began to build St Mary's College, a chantry, and Houghton later added the cloister which connects it to the cathedral.
Split into simpler sentences: In 1365, Bishop Adam Houghton and John of Gaunt began to build St Mary's College and a chantry. He later added the cloister which connects it to the cathedral.