Complex sentence: The line suffered almost no damage during the Second World War but, as a result of the division of Germany, it was cut in 1945 between Vienenburg on the West German side and Wasserleben on the East German side, and later dismantled.
Split into simpler sentences: The line suffered almost no damage during the Second World War. But, as a result of the division of Germany, it was cut in 1945 between Vienenburg on the West German side and Wasserleben on the East German side, and later dismantled.