Complex sentence: At this point, brothers Leo and Frank Kuntz began purchasing the horses with the aim of preserving the breed, and founded the Nokota Horse Conservancy in 1999, later beginning a breed registry through the same organization.
Split into simpler sentences: At this point, brothers Leo and Frank Kuntz began purchasing the horses with the aim of preserving the breed. In 1999 they founded the Nokota Horse Conservancy, later beginning a breed registry through the same organization.