Complex sentence: The Dorper is a cross of the Dorset Horn and the Blackhead Persian breeds of sheep, by the South African Department of Agriculture to breed a mutton sheep suitable to the more arid regions of the country.
Split into simpler sentences: The Dorper is a South African breed of domestic sheep developed by crossing Dorset Horn and the Blackhead Persian sheep. The breed was created through the efforts of the South African Department of Agriculture to breed a meat sheep suitable to the more arid regions of the country.