Complex sentence: Porter published her only novel, "Ship of Fools" in 1962, which was the best-selling novel in America for that year; its success finally gave her financial security (she reportedly sold the film rights for $500,000).
Split into simpler sentences: Porter published her only novel, "Ship of Fools" in 1962. Its success finally gave her financial security (she reportedly sold the film rights for $500,000).