Complex sentence: The Caddo Mountain salamander ("Plethodon caddoensis") is a species of salamander in the family Plethodontidae endemic to Arkansas in the south-central United States, and only known from the Caddo Mountains, a part of the Ouachita Mountains.
Split into simpler sentences: The Caddo Mountain salamander ("Plethodon caddoensis") is a species of salamander in the family Plethodontidae. It is endemic to Arkansas in the South Central United States, and only known from the Caddo Mountains, a part of the Ouachita Mountains.