Complex sentence: The Siege of Hulst (1645) was the last major siege of the Eighty Years' War, in which the heavily fortified town of Hulst was conquered by Dutch troops commanded by Frederick Henry after 28 days.
Split into simpler sentences: The Siege of Hulst (1645) was the last major siege of the Eighty Years' War. The heavily fortified town of Hulst was conquered by Dutch troops commanded by Frederick Henry after only 28 days.