Complex sentence: The Ulster & Delaware Railroad Historical Society is a chapter of the NRHS (National Railway Historical Society), focusing on the history of the railroads and related social, economic, and cultural institutions of the Catskill and Hudson Valley regions.
Split into simpler sentences: The Ulster & Delaware Railroad Historical Society is a chapter of the National Railway Historical Society (NRHS). It focuses on the history of the railroads and related social, economic, and cultural institutions of the Catskill and Hudson Valley regions.