Complex sentence: But in the audio interview with Truffaut, Hitchcock confirmed it was his favourite film, and later reiterated that "Shadow of a Doubt" was his favorite film in his interview with Mike Douglas in 1969 and in his interview with Dick Cavett in 1972.
Split into simpler sentences: But in the audio interview with Truffaut, Hitchcock confirmed it was his favorite film. Hitchcock later reiterated that "Shadow of a Doubt" was his favorite film in his interview with Mike Douglas in 1969 and in his interview with Dick Cavett in 1972.