The prompt' is what is in the writer's mind. In the first he is thinking about reports written by a certain person, and about no other reports,Those reports were objective. In the second, he is thinking about some reports previously referred.
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AnonymousIs there any rule that 'prompts' using commas or omitting themNot in the general case, no. However, if the antecedent noun already references a unique entity (as when it is a proper noun), the only choice is to use commas thus forming a non-restrictive relative clause.
CalifJimHowever, if the antecedent noun already references a unique entity (as when it is a proper noun), the only choice is to use commas thus forming a non-restrictive relative clause.I see. Thank you for the explanation.