Complex sentence: A principal exponent of the postmodernist tendencies common to a number of Italian composers of his generation who composed 11 operas, his most popular being "Marilyn" and "Salvatore Giuliano".
Split into simpler sentences: A principal exponent of the postmodernist tendencies common to a number of Italian composers of his generation. He composed 11 operas, his most popular being "Marilyn", and "Salvatore Giuliano".