Input (grade 13): However, he also returned to his chair in the cello section, and participated as cellist in the world premiere of Verdi's Otello (La Scala, Milan, 1887) under the composer's supervision.
Output (grade 12): When he got back to Italy Toscanini returned to his chair in the cello section, and took part as cellist in the first performance of Verdi's Otello (La Scala, 1887).