First of all, I would omit the commas because as it is the sentence implies that all bilingual people speak two languages very well, which is certainly not true. The answer to your question is yes, except that the 'people' in red is not a part of the relative clause. It is the antecedent of the relative pronoun 'who'.
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Cool BreezeFirst of all, I would omit the commas because as it is the sentence implies th