Original sentence: Some contend these 'lost' horses are killed or are sold from owner-to-owner in a downward spiral of neglect, while others believe that they are used in breeding, sold to hunters who ride horseback, and for point-to-pointing (another horse sport).The fate of these horses is uncertain
Edited sentence: Critics, based on rumour, contend these 'lost' horses are killed, but in actuality they are used in breeding, sold to hunters who ride horseback, and for point-to-pointing (another horse sport)