Which doesn't make a relative clause non-restrictive: It's a book [that/which] no one seems to like. If you want to use a relative clause in your sentence, I would say: The film's sequel , for which the trailer was released today, will arrive next Christmas. This way you get the antecedent close to the relative pronoun .
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JJDouglasSo must "for which" come at the beginning of the clause?I have already given you my opinion.
JJDouglasI suppose what I'm asking is, does the addition of "for which" make the clause subordinate?All relative clauses are subordinate clauses. For is of no importance as to whether the clause is restrictive or no