Complex sentence: Prompted by teasing from a heckler, Annie attempts to ride the same horse that the children had scared earlier, but the horse is spooked once again and gallops through the city with Annie on its back.
Split into simpler sentences: Prompted by teasing from a heckler, Annie attempts to ride the same horse that the children had scared earlier. But the horse is spooked once again and gallops through the city with Annie on its back.