Complex sentence: The cliffs are occasionly used as stand in for The White Cliffs of Dover (since they are no longer white) In WW2 films, they also feature at the beginning of Robin Hood, the Prince of thieves film.
Split into simpler sentences: The cliffs are occasionly used as stand in for The White Cliffs of Dover (since they are no longer white) in WW2 films. They also feature at the beginning of Robin Hood, the Prince of thieves film.