Complex sentence: He also had a major part in the 1970 epic film "Waterloo", playing the role of the Duke of Wellington's chief of staff, William de Lancey, starring alongside Christopher Plummer, Jack Hawkins and Orson Welles.
Split into simpler sentences: He also had a major part in the 1970 epic film "Waterloo", playing the role of the Duke of Wellington's chief of staff, William de Lancey. He starred alongside Christopher Plummer, Jack Hawkins and Orson Welles.