Complex sentence: His descendant Philippe Bonaparte is the Holy Alliance's ambassador to the North American Union based in its capital, Victoria, who attempted to subtley inform the North American authorities about the Holy Alliance's role in the theft of the titular painting.
Split into simpler sentences: His descendant Philippe Bonaparte is the Holy Alliance's ambassador to the North American Union based in its capital, Victoria. He attempted to subtley inform the North American Union's authorities about the Holy Alliance's role in the theft of the titular painting.