The underlined portion is described by the terms appositive, nonrestrictive, and restrictive.
Appositive, nonrestrictive, and restrictive are the terms that describe the underlined portion of the sentence. An appositive renames or explains a noun, a nonrestrictive clause provides additional information that can be omitted without changing the intended meaning of the sentence, and a restrictive clause is essential to the meaning of the sentence.
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