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: Up until 1990, Saudi Arabia played an important role in restraining what groups no wait which groups did it play an unimportant role in restraining?
A:
Up until 1990, Saudi Arabia played an unimportant role in restraining what groups?