The watch which is a birthday present for my sister was bought from Japan.
Is the sentence grammatically correct?
The words are grammatically correct but it needs some commas: The watch, which is a birthday present for my sister, was bought from Japan. This is assuming that you intend a non-defining relative clause, which seems very likely.
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The words are grammatically correct but it needs some commas:
The watch, which is a birthday present for my sister, was bought from Japan.
This is assuming that you intend a non-defining relative clause, which seems very likely.