Complex sentence: He served as a curate at the Church of the Transfiguration in Freeport, New York from 1974 to 1976, when he was called to be Rector of St. Mary's Church, Charleroi, Pennsylvania, in the Diocese of Pittsburgh.
Split into simpler sentences: He served as a curate, at the Church of the Transfiguration in Freeport, New York from 1974 to 1976. In 1976 he was called to be Rector of St. Mary's Church, Charleroi, Pennsylvania, in the Diocese of Pittsburgh.