Simplify the following text for a Grade 11 native English-speaking person.
Original: 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 .
Simplified: 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 ) .