Complex sentence: "What Rough Beast" is a phrase taken from the 1919 W. B. Yeats poem "The Second Coming" and has been used as the title for several works of fiction and non-fiction.
Split into simpler sentences: What Rough Beast is a phrase taken from the 1919 W. B. Yeats poem "The Second Coming". It has been used as the title for multiple works of fiction and non-fiction.