Complex sentence: The title of the film comes from Thomas Merton's poem of the same name, "Original Child Bomb", which is a coinage derived from the Japanese term for the atom bomb, "genshi badukan".
Split into simpler sentences: The title of the film comes from Thomas Merton's poem of the same name, "Original Child Bomb". The phrase "original child bomb" was derived from the Japanese term for the atom bomb, "genshi badukan".