The rule is that you should never have an odd number of commas between the subject and the verb in a sentence.
He should replace the comma with “that” and make a nice clean restrictive clause. Or he could put the comma after “certain.”
Bio
Rogers George has been a technical writer for more than 20 years. He has written on subjects as diverse as outhouse assembly, restaurant reviews, software, information security, and scientific equipment. He has his own writing consultancy and is always happy to discuss writing and grammar. Drop him a line at curmudgeon@writing-rag.com.
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