Complex sentence: Ethan Stiefel (born 13 February 1973 in Tyrone, Pennsylvania) is the artistic director of the Royal New Zealand Ballet and was a principal dancer with American Ballet Theatre (ABT) from 1997 till July 2012.
Split into simpler sentences: Ethan Stiefel (born 13 February 1973 in Tyrone, Pennsylvania) is an American dancer. He was a principal dancer with American Ballet Theatre (ABT) from 1997 till July 2012.