Complex sentence: In November, 1907, the singer Theodore Van Yorx gave a recital of Haile's songs at Mendelssohn Hall in New York City, accompanied by the composer at the piano.
Split into simpler sentences: In November, 1907, singer Theodore Van Yorx gave a recital of Haile's songs at Mendelssohn Hall in New York City. He was accompanied by the composer at the piano.