Simplify the following text for a Grade 5 native English-speaking person.
Original: Kubrick co-wrote the screenplay with science fiction writer Sir Arthur C. Clarke , expanding on Clarke 's short story `` The Sentinel '' .
Simplified: Kubrick based the movie on a short story called the `` The Sentinel '' that was written by the science fiction author Arthur C. Clarke . Kubrick worked with Arthur C. Clarke to make the film .