Complex sentence: Neither the Liberals nor the Socialists leading Sweden through the last year of World War I were the slightest bit interested in anything that had to do with activist adventurous policies; the king fully agreed with his cabinet on this point.
Split into simpler sentences: Neither the Liberals nor the Socialists leading Sweden through the last year of World War I were the slightest bit interested in anything that had to do with activist adventurous policies. And the king fully agreed with his cabinet on this point.