Complex sentence: In 1927, movie producer Cecil B. DeMille charged Rand, who was working for him as a junior screenwriter, with writing a script for what would become the film "Skyscraper".
Split into simpler sentences: In 1927, Rand was working as a junior screenwriter for movie producer Cecil B. DeMille. He asked Rand to write a script for what would become the film "Skyscraper".