Complex sentence: Joseph Arthur Costello (May 9,1915--September 22,1978) was a Roman Catholic bishop of the Catholic Church in the United States who served as an auxiliary bishop of the Archdiocese of Newark, New Jersey from 1963 to 1978.
Split into simpler sentences: Joseph Arthur Costello (May 9,1915--September 22,1978) was a bishop of the Catholic Church in the United States. He served as an auxiliary bishop of the Archdiocese of Newark from 1963 to 1978.