Complex sentence: The 1981 cold war thriller "The Amateur" involves CIA agents using Bacon's bilteral cipher in which a Baconian theorist and cipher-expert Professor Lakos (played by Christopher Plummer) assists the hero to uncover the truth.
Split into simpler sentences: The 1981 cold war thriller "The Amateur" involves CIA agents using Bacon's bilteral cipher. In the course of the plot, Professor Lakos, a Baconian theorist and cipher-expert played by Christopher Plummer, assists the hero to uncover the truth.