Complex sentence: On 2 December 2010, Steel performed, with piano prodigy Emily Bear, O Mio Babbino Caro and O Holy Night at Carnegie Hall in New York, becoming the youngest classical singer ever to sing at Carnegie Hall.
Split into simpler sentences: On 2 December 2010, Steel performed, with piano prodigy Emily Bear, O Mio Babbino Caro and O Holy Night at Carnegie Hall in New York. Hollie became the youngest classical singer ever to sing at Carnegie Hall.