Complex sentence: It was adapted into a film of the same name in 1959, directed by Carol Reed and starring Alec Guinness; in 1963 it was adapted into an opera by Malcolm Williamson, to a libretto by Sidney Gilliat, who had worked on the film.
Split into simpler sentences: It was adapted into a film of the same name in 1959, directed by Carol Reed and starring Alec Guinness. In 1963 it was adapted into an opera by Malcolm Williamson, to a libretto by Sidney Gilliat, who had worked on the film.