Complex sentence: On March 3,1908 at Grace Church at 802 Broadway in New York City, he married Cornelia Averell Harriman (1884-1966), the second daughter of railroad executive E. H. Harriman and his wife Mary Williamson Averell.
Split into simpler sentences: On March 3,1908, he married Cornelia Averell Harriman (1884-1966) at Grace Church at 802 Broadway in New York City. Cornelia was the second daughter of railroad executive E. H. Harriman and his wife Mary Williamson Averell.