Answer:-
The word "which" signals a nonrestrictive clause in a complex sentence. A nonrestrictive clause adds extra information to the sentence without changing its core meaning. For example, in the sentence "The book, which I finished yesterday, was fascinating," the clause "which I finished yesterday" provides additional information about the book but isn't essential to understand which book is being talked about. Nonrestrictive clauses are typically set off by commas, and using "which" helps to indicate that the information is supplementary and not crucial for identifying the subject of the sentence.
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