Complex sentence: Cooper's only film in 1946 was Fritz Lang's romantic thriller "Cloak and Dagger", about a mild-mannered physics professor recruited by the OSS during the last years of World War II to investigate the German atomic bomb program.
Split into simpler sentences: Cooper's only film in 1946 was Fritz Lang's romantic thriller "Cloak and Dagger". In the film, Cooper plays a mild-mannered physics professor recruited by the OSS during the last years of World War II to investigate the German atomic bomb program.