Complex sentence: During the Second World War, the Netherlands was occupied by Nazi Germany and, on 17 April 1945, a vengeful German command ordered the dike of the Wieringermeer to be blown up: the Wieringmeer was inundated.
Split into simpler sentences: During the Second World War, the Netherlands was occupied by Nazi Germany. On 17 April 1945, a vengeful German command ordered the dike of the Wieringermeer to be blown up: the area was inundated.