In English, commas are used with nonrestrictive elements to provide additional, non-essential information.
Commas with nonrestrictive elements: In the sentence 'Toward the end of the flight to Denver, Felix was awakened by the voice of the captain who announced the beginning of their descent,' the relative clause 'who announced the beginning of their descent' is nonrestrictive as it provides additional, non-essential information. Therefore, it should be set off with commas.
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