Complex sentence: When he was 13, Sabu was discovered by documentary film-maker Robert Flaherty who cast him in the role of an elephant driver in the 1937 British film "Elephant Boy", based on "Toomai of the Elephants", a story by Rudyard Kipling.
Split into simpler sentences: When he was 13, Sabu was discovered by documentary film-maker Robert Flaherty, who cast him in the role of an elephant driver in the 1937 British film "Elephant Boy". This was adapted from "Toomai of the Elephants", a story by Rudyard Kipling.