Complex sentence: In his attitute to the growing national unrest in the twin-duchies he often seemed hesitating and half-hearted which damaged his position, and not until 1846 did he clearly support the idea of Schleswig being a Danish area.
Split into simpler sentences: In his attitute to the growing national unrest in the twin-duchies he often seemed hesitating and half-hearted which damaged his position. Not until 1846 did he clearly support the idea of Schleswig being a Danish area.