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

What happens when the what cause the immune system to treat foreign organisms like normal tissues?
What causes the immune system to treat foreign organisms like normal tissues?

Why did er when did the Syrian Civil War begin?
When did the Syrian Civil War begin?

What difficulties was Johnson no Shirley having?

What difficulties was Shirly having?