Complex sentence: John Martin Henni (June 15,1805--September 7,1881) was a Swiss-born prelate of the Roman Catholic Church who served as the first Archbishop of the Archdiocese of Milwaukee, Wisconsin from 1843 until his death in 1881.
Split into simpler sentences: John Martin Henni (June 15,1805--September 7,1881) was a Swiss-born prelate of the Roman Catholic Church. He was the first Archbishop of Milwaukee, serving from 1843 until his death in 1881.