Complex sentence: While never an unknown, his greatest notoriety came late in life with the ongoing relationship with the late Italian tenor Luciano Pavarotti, conducting his many concerts throughout the world, on television for PBS, and appearing as himself in Mr. Pavarotti's only movie, YES !
Split into simpler sentences: While never an unknown, notoriety came late in life with the ongoing relationship with the late Italian tenor Luciano Pavarotti. He conducted many of his concerts throughout the world, on television for PBS, and appeared as himself in Mr. Pavarotti's only movie, YES!