Complex sentence: In addition to an annual concert series, the choir has performed with the Young Musicians Foundation Orchestra and was the only choir to sing at the 2000 Democratic National Convention, performing with various artists including Luther Vandross, Stevie Wonder, and Mary Chapin Carpenter.
Split into simpler sentences: In addition to an annual concert series, the choir has performed with the Young Musicians Foundation Orchestra. ACC was the only choir to sing at the 2000 Democratic National Convention, performing with artists including Luther Vandross, Stevie Wonder, and Mary Chapin Carpenter.