Complex sentence: However, the 1800s saw the rise of national romanticism in Norway, as the country gradually regained its independence, and the independent medieval kingdom was used as a source of new national symbols to rally around.
Split into simpler sentences: However, the 1800s saw the rise of national romanticism in Norway as the country gradually regained its independence. As a result, the independent medieval kingdom was used as a source of new national symbols to rally around.