Complex sentence: Later, the King's failure, in the face of mounting evidence, to move against the Mussolini regime's abuses of power led to much criticism and had dire future consequences for Italy and for the monarchy itself.
Split into simpler sentences: Later, the King's failure, in the face of mounting evidence, to move against the Mussolini regime's abuses of power led to much criticism. Eventually, the King's decision had dire future consequences for Italy and for the monarchy itself.