Complex sentence: The Dutch king however was now convinced his dream of a unified Netherlands was an illusion, the European powers had seen how fragile Belgium really was and this resulted in a final division which was more favourable to the Dutch.
Split into simpler sentences: The Dutch king, however, was now convinced his dream of a unified Netherlands was an illusion. The European powers came to see how fragile Belgium was and this resulted in a final division which was more favourable to the Dutch.