Original sentence: These horses and ponies either were a recognized, distinct breed of horse that no longer exists as such, or are a species of equus caballus that has become extinct at some point since domestication of the horse.This section does not include any species within evolution of the horse prior to modern equus caballus
Edited sentence: These horses and ponies either were a recognized, distinct breed of horse that no longer exists as such, or are varieties or races of Equus caballus that have become extinct at some point since domestication of the horse.This section does not include any species within evolution of the horse prior to modern Equus caballus