Unfortunately, few of us have much experience dealing with the threat of terrorism, so its been difficult to get facts about how we should respond.
主干:...few...have much experience..., so its been difficult to get...
1. so是个并列连词,连接两个分句,表示因果关系。
2. 前一个分句的谓语用了have experience doing...句型,表示有做......的经验。
3. 后一个分句用了it is+形容词+不定式句型,it是形式主语,真正的主语是不定式to get facts...;句末的about...是介词短语作定语修饰facts,about的宾语是个how引导的名词性从句。
译文:不幸的是,我们中很少有人对付恐怖主义威胁的经理,因此很难得到我们应该如何应对恐怖威胁的事实。