Which word signals a nonrestrictive clause in a complex sentence?

The relative pronouns “which,” “who,” “whom,” and “whose” can all be used to signal a nonrestrictive clause in a complex sentence.

These pronouns often introduce an adjective clause (or relative clause), which is a type of dependent clause. When that dependent clause is connected to an independent clause, it forms a complex sentence.

Adjective clauses can be either restrictive or nonrestrictive. Nonrestrictive clauses are set off with commas.

Nonrestrictive clauses in complex sentences examples
Camila ordered an americano, which is an espresso and water.

My best friend, who is named Ana, is coming to visit me.

The CEO, whom most people assumed was going to retire, took a job at another company.

Emilio, whose apartment I am renting, has decided to move back to town.

Note that the relative pronoun “that” is only used in restrictive clauses.

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