No, it's not correct. This one is fine. The commas indicate a non-restrictive clause.
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AnonymousIf I omit the commas in the sentence, is it accurate then?(Thanks a lot)Ms. Helen, who is retiring from GM, will be delivering a lecture tomorrow.
AnonymousMs. Helen, that is retiring from GM, will be delivering a lecture tomorrow.This is not correct. Only a wh relative word is possible in non-restrictive clauses, in this case who.
AnonymousIf I omit the commas in the sentence, is it correct then?No. You can’t use a restrictive clause to modify a