Complex sentence: At one time considered an "endangered species", conservation efforts have had some success and the largest sub-population in Pakistan may now exceed 1000 individuals, and the IUCN has rated its status as "near-threatened".
Split into simpler sentences: At one time considered an "endangered species", conservation efforts have had some success and the largest sub-population in Pakistan may now exceed 1000 individuals. As a result, the International Union for Conservation of Nature has rated its status as "near-threatened".