for what is there that they had not screwed out of him under the torture?
这不是一个完整的句子,而是一个介词短语:for +名词性从句。what 为 there is 的主语,that they had not screwed out of him under the torture 是 what 的定语。
不过,若是名词性从句,语序有问题,应为 what there is,句末也不该用问号。
for 在这里表示原因或目的,“因为;为了”。
就本句结构而言, for 是多余的。 如果去掉 for ,则是一个完整的特殊疑问句:
What is there that they had not screwed out of him under the torture?
还有什么是他们在严刑逼供中没有从他那里逼供出来的?
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