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这句话的前半部分是主干，后面的which is accused of是定语从句，修饰Islamist group。which has left……也是定语从句，修饰violence。
2.Now that is a big deal, I would not have chosen her but I understand why President Obama did.
would not have是虚拟语气。表示与过去的事实相反，条件状语从句中的谓语动词用过去完成时，主句中的谓语动词则用“would / should / might / could + have +过去分词”。如：
If he had taken my advice, he would have succeeded in the competition.
3.The settlement still needs to be approved by a U.S. court.
need还有一个比较特殊的用法。
need doing表示“需要被做”，主语一般为物，相当于need to be done；need to dosth．表示“需要做某事”，主语一般为人。类似此用法的动词还有want(需要)等，例如：
(1)My car needs mending。=My car needs to be mended．
我的小汽车需要修理。
(2)We need to study hard．
我们需要努力学习。