Complex sentence: St. Mark's Evangelical Lutheran Church was an Evangelical Lutheran Church in America church founded in 1846 as a mission church of the Evangelical Lutheran Church of St. Matthew, located in the Lower East Side, Manhattan, New York City (then called Trinity Lutheran Church).
Split into simpler sentences: St. Mark's Evangelical Lutheran Church was an Evangelical Lutheran Church in America church, located in the Lower East Side, Manhattan, New York City. It was founded in 1846 as a mission church of the Evangelical Lutheran Church of St. Matthew, (then called Trinity Lutheran Church).