Original: One of his last compositions was the Himne a les Nacions Unides (Hymn of the United Nations); he conducted its first performance in a special concert at the United Nations on October 24, 1971, 2 months before his 95th birthday.
Simplified: One of his last compositions was the Himne a les Nacions Unides (Hymn of the United Nations); he conducted its first performance in a special concert at the United Nations on 24 October 1971, 2 months before his 95th birthday.