Complex sentence: The unexpected controversy revealed troubling insights into persistent anti-Semitism in Canada and the willingness of partisan historians to shield the reputations of wartime Canadian politicians from accusations of bigotry, but after it was the topic of an embarrassing Senate investigation there was renewed official interest in the museum.
Split into simpler sentences: The unexpected controversy revealed evidence of persistent anti-Semitism in Canada and the willingness of involved partisan historians to shield the reputations of wartime Canadian leaders from accusations of bigotry. However, after it was the topic of an embarrassing Senate investigation there was renewed official interest in the museum.