Complex sentence: The Roman Catholic Diocese of Ballarat is a suffragan Latin rite diocese of the Archdiocese of Melbourne, erected in 1874, covering the west, Wimmera, and Mallee regions of Victoria, Australia.
Split into simpler sentences: The Roman Catholic Diocese of Ballarat is a Roman Catholic diocese in the ecclesiastical province of Melbourne. The geographic remit covers the west, Wimmera and Mallee regions of Victoria, Australia.