Complex sentence: Sandy reveals that she was in fact rejected from Julliard, and goes on to explain that what she really wants is just to live in New York City, to which Betty says Sandy should wait a few more years, sparking an argument.
Split into simpler sentences: Sandy reveals that she was in fact rejected from Julliard, and goes on to explain that what she really wants is just to live in New York City. Betty urges Sandy to wait a few more years, sparking an argument.