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

When did What centuries did the Roman times take place within?
What centuries did the Roman times take place within?

When was the plague no who fought in the great Northern war?
Who fought in the great Northern war?

By how much did Kent-Brown reduce his investment in South Africa or sorry Harvard?
By how much did Kent-Brown reduce his investment in Harvard?