Complex sentence: That same year, Firth played a part in the film "Luther", in which he portrayed Cardinal Aleander, the papal advisor who sought Luther's excommunication and death, and for which he received the CFT Excellence Award for Best Actor in a Motion Picture.
Split into simpler sentences: That same year, Firth played a part in the film "Luther", in which he portrayed Cardinal Aleander, the papal adviser who sought Luther's excommunication. For his performance, he received the CFT Excellence Award for Best Actor in a Motion Picture.