Complex sentence: The consequences of the government's choice to not surrender, and the king's support of that, was continued hostilities, that the Norwegian royal family underwent a dramatic escape and that World War II involved Norway on the Allied side.
Split into simpler sentences: The consequences of the government's choice to not surrender, and the king's support of that, was continued hostilities. As a result, the Norwegian royal family underwent a dramatic escape that World War II involved Norway on the Allied side.