Complex sentence: St. Joseph's Church was started by Mill Hill Missionaries who came from Kafirstan Diocese and later on was being taken care by Society of Jesus and now is part of Diocese of Jammu Srinagar.
Split into simpler sentences: St. Joseph's Church was started by Mill Hill Missionaries who came from Kafirstan Diocese. Later on it was looked after by Society of Jesus and is now part of the Diocese of Jammu Srinagar.