Complex sentence: Best known today for his opera "Risurrezione" (1904) and above all forhaving completed Puccini's opera "Turandot" in 1926, he had considerable success with several of his own works during his lifetime.
Split into simpler sentences: Best known today for his opera "Risurrezione" (1904) and above all for having completed Puccini's opera "Turandot" in 1926. He had considerable success with several of his own works during his lifetime.