Complex sentence: Kaimanawa Horses are a population of New Zealand free-roaming feral horses descended from domestic horses that were released in the late 1800s and early 1900s in the middle of the North Island around the Kaimanawa Ranges.
Split into simpler sentences: Kaimanawa Horses are a population of feral horses in New Zealand that are decended from domestic horses released in the 19th and 20th centuries. The Kaimanawa breed descended from domestic horses that were released in the late 1800s and early 1900s in the middle of the North Island of New Zealand around the Kaimanawa Ranges.