Complex sentence: The Central Railroad of New Jersey, commonly known as the Jersey Central Lines or CNJ, was a Class I railroad with origins in the 1830s, lasting until 1976 when it was absorbed into Conrail with the other bankrupt railroads of the Northeastern United States.
Split into simpler sentences: The Central Railroad of New Jersey, commonly known as the Jersey Central Lines or CNJ, was a Class I railroad with origins in the 1830s. In 1976 it was absorbed into Conrail with the other bankrupt railroads of the Northeastern United States.