Complex sentence: Even Alfred Hitchcock, whose own films inspired the genre, was influenced by the "giallo" in his later career, no more evident than with his penultimate film, "Frenzy" (1972).
Split into simpler sentences: Even Alfred Hitchcock, whose own films inspired the genre, was influenced by the "giallo" in his later career. This was no more evident than with his penultimate film, "Frenzy" (1972).