Complex sentence: He was encouraged by his friend and mentor Ambrose Bierce the journalist, short story writer and veteran of the Civil War, who, it has been claimed, Edward F. O'Day, "The Poetry of San Francisco", "The Lantern".
Split into simpler sentences: He was encouraged by his friend and mentor Ambrose Bierce the journalist, short story writer and veteran of the Civil War. It has been claimed, Edward F. O'Day, "The Poetry of San Francisco", "The Lantern".