Complex sentence: Saint Mary's Cathedral Rubaga, commonly referred to as Rubaga Cathedral, is the parent cathedral of the Roman Catholic Archdiocese of Kampala, the oldest Roman Catholic diocese in Uganda.
Split into simpler sentences: Saint Mary's Cathedral Rubaga, commonly referred to as Rubaga Cathedral, is the parent cathedral of the Roman Catholic Archdiocese of Kampala. It is the home church of Archbishop of Kampala, the oldest Roman Catholic diocese in Uganda.