Complex sentence: The Church of St. Mark is a former Roman Catholic parish church under the authority of the Roman Catholic Archdiocese of New York, located at Stuyvesant Ave. at Second Ave. in Manhattan, New York City.
Split into simpler sentences: The Church of St. Mark is a former Roman Catholic parish church under the authority of the Roman Catholic Archdiocese of New York. It was located at Stuyvesant Ave. at Second Ave. in Manhattan, New York City.