Complex sentence: After the American Civil War, when funds for continued financial help were not available from the war-torn state or private sources, it finally succumbed to the competition, and was bought and dismantled by one of the railroads in the 1870s.
Split into simpler sentences: After the American Civil War, when funds for continued financial help were not available from the war-torn state or private sources, it finally succumbed to the competition. It was bought and dismantled by one of the railroads in the 1870s.