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

Example Input: Where did Mongke Khan attack the Song dynasty or rather where did he defend it?
Example Output:  Where did Mongke Khan defend the Song dynasty?

Example Input: Where rather who was one of the most famous people born in Warsaw?
Example Output: Who was one of the most famous people born in Warsaw?

Example Input: At which or no rather what time did a river system develop in the Upper Rhine Graben?
Example Output:
What time did a river system develop in the Upper Rhine Graben?