Complex sentence: Rare bird species also breed in the saline lakes of the Ordos, among them Relict Gulls ("Larus relictus"), For this species the Ordos is home to about one quarter of the world's population.
Split into simpler sentences: Rare bird species also breed in the saline lakes of the Ordos, among them Relict Gulls ("Larus relictus"). For the latter species the Ordos is home to about one quarter of the world's population.