Convert a disfluent question to a proper question. A disfluent question is a question that has some interruptions in it while framing. A proper question is the correct form of the question without any disfluency.

When did Da Yuan, no actually it was Khan, when did he formally declare the Yuan dynasty?
When did Khan formally declare the Yuan dynasty?

How did no Who masterminded many terror attacks?
Who masterminded many terror attacks?

What are or actually who were the main detractors of the humoral theory of immunity?

Who were the main detractors of the humoral theory of immunity?

