英语翻译But what many people who have never formed a corporation

但是许多没有成立过公司的人不知道的是公司并不是一件真正的事情.公司仅仅知识一个含有某些法律文件的文件夹,坐在某个律师办公室里在政府机构中注册.
But what many people (who have never formed a corporation) do not know is (that a corporation is not really a thing).
who have never formed a corporation修饰many people
that a corporation is not really a thing做宾语,
a corporation is not really a thing修饰that
A corporation is (merely a file folder with some legal documents in it,sitting in some attorney's office registered with a state government agency.)
a file folder with some legal documents in it和 sitting in some attorney's office registered with a state government agency属于并列短语,都是说明公司的.