Complex sentence: Madonna had adopted a garish, platinum blond hairstyle for the "Who's That Girl" movie which she used in the music video; it was her way of reviving the comedy heroine of the 1930s Hollywood screwball comedies.
Split into simpler sentences: Madonna had adopted a garish, platinum blond hairstyle for the "Who's That Girl" movie. It was her way of reviving the comedy heroine of the 1930s Hollywood screwball comedies.