Complex sentence: The company was reorganized as the Carthage and Adirondack Railway in the spring of 1883 after a mine owner in Jayville decided to acquire the Black River and St. Lawrence Railway to extend it from Little River in St. Lawrence County to Jayville.
Split into simpler sentences: The company was reorganized as the Carthage and Adirondack Railway in the spring of 1883 after a mine owner in Jayville acquired the Black River and St. Lawrence Railway. He planned to extend the rails from Little River in St. Lawrence County to Jayville.