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

When did the no in what year did the Black Death originate in Central Asia?
In what year did the Black Death originate in Central Asia?

What molecules er why do differentiated effector cells ebb during wake periods?
Why do differentiated effector cells ebb during wake periods?

When was no what decade was the country club built in?

What decade was the country club built in?