Comma in relative clause - English Language & Usage Stack ...
english.stackexchange.com › questions › 528379Mar 23, 2020 · Thus, we separate this relative clause with commas. If the relative clause provides necessary information for the sentence to make sense, then don't separate the clause with commas: "Every criminal who has been convicted of murder must be put behind bars." Here, "who has been convicted of murder" is essential to the meaning of the sentence. It would be a gross misreading of the sentence to gloss over this relative clause by reading: "Every criminal must be put behind bars."