Complex sentence: The story of the Old Road involves one railroad tycoon and four railroads: the Lackawanna, the Central Railroad of New Jersey (CNJ), the Morris & Essex Railroad and the Warren Railroad.
Split into simpler sentences: The story of the Old Road involves four different railroads and one railroad tycoon. The four railroads were the Central Railroad of New Jersey (CNJ), the Lackawanna Railroad, the Morris & Essex Railroad and the Warren Railroad.