Complex sentence: Established in 1980, Antioch Dunes National Wildlife Refuge was the first national wildlife refuge in the country established for the purpose of protecting endangered plants and insects, specifically the Lange's Metalmark Butterfly, Antioch Dunes evening primrose, and Contra Costa wallflower.
Split into simpler sentences: Established in 1980, Antioch Dunes National Wildlife Refuge was the first national wildlife refuge in the country established for the purpose of protecting endangered plants and insects. It was the first national wildlife refuge in the country established to protect endangered plants and insects, specifically the Lange's Metalmark Butterfly, Antioch Dunes evening primrose, and Contra Costa wallflower.