Complex sentence: The review says the film is a reaction to Mankiewicz's own experiences during the communist witch hunts of the late 1940s and early 1950s which were initiated by Senator Joseph McCarthy, whilst he was President of the Directors Guild of America (1950-51).
Split into simpler sentences: The review says the film is a reaction to Mankiewicz's own experiences during the communist witch hunts of the late 1940s and early 1950s which were initiated by Senator Joseph McCarthy. Whilst President of the Directors Guild of America (1950-51).