TASK DEFINITION: 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.
PROBLEM: Why did Yuan's successors win control of the rest of the Mongol empire, oops Kublai's successor?

SOLUTION: Why did Kublai's successors win control of the rest of the Mongol empire?

PROBLEM: What is a science that examines the structure and function of the disease no brain?

SOLUTION: What is a science that examines the structure and function of the brain?

PROBLEM: What are Ctenophores and cnidarians classified as no change that to where does the jelly-like layer come from in complex animals?

SOLUTION:
Where does the jelly-like layer come from in complex animals?