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

Example input: Who did the Han Chinese want to help the Khitan no I mean the Mongols fight?
Example output: Who did the Han Chinese want to help the Mongols fight?
Example explanation: The input initially means Khitan and then changes to Mongols, hence this is correct.
Q: The elements from the rift system in the Alpine um Rhine and what other river drained the northern flanks of the alps?
A:
The Rhine and what other river drained the northern flanks of the alps?