Complex sentence: Hitchens considered it one of the worst political smears he had seen in his time in Washington, speculating further that it was widely known that European and Asian member countries who disagreed with the Iraq war wanted to punish Wolfowitz for his involvement.
Split into simpler sentences: Hitchens considered it one of the worst political smears he had seen in his time in Washington. He also speculated that It was widely known that European powers who disagreed with the Iraq war wanted to punish Wolfowitz for his involvement.