You can't use "that" to introduce a non-restrictive clause. The part before the comma is the antecedent of the relative pronoun. If you wanted to use "that", however, you would have to say something like: My daughter is planning to spend a year before university working in Australia, and that seems to me to be a sensible idea.
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ozzourtiYou can't use "that" to introduce a non-restrictive clause.Isn't it used here?
Nina_NiaIsn't it used here?I refuse to live in any house that Jack built.Yes, but it is a restrictive clause. Without the part in bold, the meaning of the sentence would be completely different.
Nina_Nia My daughter is planning to spend a year before university working in Australia, ___ seems to me to be a sensible idea.That's non-restrictive, and need 'that' - as ozzourti told you.
Nina_NiaI refuse to live in any house that Jack builtThat's restrictive.