Complex sentence: In 1808, Pope Pius VII divided the Catholic churches in the United States and its territories into five diocese, and the Catholic parishes in the northwest territories, which included the Indiana Territory, became part of the Diocese of Bardstown.
Split into simpler sentences: In 1808, Pope Pius VII divided the Catholic churches in the United States and its territories into five diocese. The Catholic parishes in the northwest territories, which included the Indiana Territory, became part of the Diocese of Bardstown.