Complex sentence: In 2009, the fair changed its format to feature two different national performing artists every day, rather than having the same artist perform twice on the same date, in order to attract additional people to the fair with acts appealing to different audiences.
Split into simpler sentences: In 2009, the fair changed its format to feature two different national performing artists every day. Before that, the same artist performed twice on the same date, limiting opportunities to attract additional people to the fair by offering acts with different audiences.