Original: In 1632 during the Thirty Years' War, the city, occupied by the forces of Gustavus Adolphus of Sweden, was besieged by the army of Imperial general Albrecht von Wallenstein.
Simplified: In 1632 during the Thirty Years' War, the Imperial general Albrecht von Wallenstein besieged King Gustavus Adolphus of Sweden in the Siege of Nuremberg.