The bank has several foreign branches, all of which are located in Asia.
The bank has several foreign branches. All of them are located in Asia.
I understand that sentences above are grammatical.
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My question is: why All of which are located in Asia is unacceptable in The bank has several foreign branches. All of which are located in Asia?
I wouldn't say that your last example is ungrammatical; it's just a much less likely alternative to your first example. Supplementary relatives typically consist of a clause set apart by punctuation, but they can also be a separate sentence, as here.
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I wouldn't say that your last example is ungrammatical; it's just a much less likely alternative to your first example.
Supplementary relatives typically consist of a clause set apart by punctuation, but they can also be a separate sentence, as here.