Complex sentence: Both the basis and the conclusion of this view have been attacked by some revisionist academics and politicians, with revisionists questioning the significance of the Peace, and some commentators and politicians attacking the Westphalian system of sovereign nation-states.
Split into simpler sentences: Both the basis and the conclusion of this view have been the subject of revisionist criticism or attacks among some academics and politicians, chiefly questioning the significance of the Peace. Other commentators and politicians have opposed the Westphalian system of sovereign nation-states.