Given a disfluent sentence, modify the sentence to it to its equivalent fluent form, preserving the meaning of the sentence.

The planet Vulcan was predicted to explain the what with planet Mercury no Saturn?
The planet Vulcan was predicted to explain the what with planet Saturn?

Who were later Yuan emperors isolated um what problems did the Yuan dynasty have near its end?
What problems did the Yuan dynasty have near its end?

How many sea level drops no um major ice ages have occurred?
How many major ice ages have occurred?