Complex sentence: Pope Leo XIII created the Diocese of Trenton in 1881 by breaking it off from the Archdiocese of Newark, which then controlled all of New Jersey, the Diocese of Camden and the Diocese of Paterson followed.
Split into simpler sentences: Pope Leo XIII created the Diocese of Trenton in 1881 by breaking it off from the Archdiocese of Newark, which then controlled all of New Jersey. The Diocese of Camden and the Diocese of Paterson followed.