Complex sentence: Each judge has the length of the auditioner's performance to decide if he or she wants that singer on his or her team; if two or more judges want the same singer (as happens frequently), the singer has the final choice of coach.
Split into simpler sentences: Each judge has the length of the auditioner's performance to decide if he or she wants that singer on his or her team. If two or more judges want the same singer (as happens frequently), the singer has the final choice of coach.