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?

What can or no make that where can a tribute to the fall of Katyn be found?
Where can a tribute to the fall of Katyn be found?

When did Where did no Spanish Catholic move after British takeover in Florida?

Where did no Spanish Catholic move after British takeover in Florida?