Original sentence: All fighting is done by one stallion.Although sometimes they let the bachelors stay to help a while.But if it concerns the whole group, the job is left to the stallion.If there are any fights, it is just showing off.It's also useless to fight for mares.On average, the Namib desert horse only drinks water every thirty hours in summer and seventy hours in winter.One or two stallions and a few mares and foals.The Namib desert horse usually go around in herds of ten.The horses switch leaders on a daily basis.The leader isn't very important to the herd so there is hardly any battles for leadership.The main job of the stallion is to keep bachelor groups away.The mare decides when to go, stop, choose another grazing spot, and when to go to the water trough.The mare picks her mate.There is enough food, water, and shade for all of them.There is hardly any competition for mares.There is no reason to fight for what they want.They are protected by a stallion or two.Unless it is specifically about foals.When a foal is threatened it is usually the mother who takes care of it
Edited sentence: Due to scarcity of water, the Namib desert horse sometimes has to go without water for as long as thirty hours in summer and has been known to go close to 72 hours without water during the winter.The Namib desert horse usually live in herds of up to ten animals, consisting of one or, occasionally, two stallions with a few mares and foals.The horses switch leadership frequently, sometimes even on a daily basis.The lead mare decides when to go, stop, choose another grazing spot, and when to go to a water source.The stallion will deal with threats to the entire herd, though in many cases, the stallion primarily keeps bachelor animals away.Their are few natural predators in the area, other than the Hyena, which poses a threat primarily to foals.There are few serious fights, most are for show.There are sufficient resources for the animals, so leadership isn't very important to the herd, resulting few battles for leadership.When a foal is threatened, it is usually the mare that is the mother of the foal who defends her young