The correct form from the sentence:
<u><em>When Suzie´s back is turned, Jason swiped her priceless necklace </em></u>
Would be:
<u><em>Suzie´s back was turned, when Jason swiped her priceless necklace.</em></u>
Misplaced modifiers could make the reader confuse when understanding a sentence.
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Answer:
it’s Epigraph