TASK DEFINITION: Given a disfluent sentence, modify the sentence to it to its equivalent fluent form, preserving the meaning of the sentence.
PROBLEM: Who no make that what captured the Vosges Mountains?

SOLUTION: What captured the Vosges Mountains?

PROBLEM: What did Article 20 of the Allied Armistice terms require Warsaw no Germany to withdraw from?

SOLUTION: What did Article 20 of the Allied Armistice terms require Germany to withdraw from?

PROBLEM: How no I mean when was Thoreau's essay published?

SOLUTION:
When was Thoreau's essay published?