In the sentence, "They had to deal with the base's destruction, the extent of which was unknown."
Should "The extent of which was unknown" be a second sentence?
No, it;s a subordinate, relative clause. You'd have to say eg They had to deal with the base's destruction. "
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No, it;s a subordinate, relative clause.
You'd have to say eg They had to deal with the base's destruction. The extent of the destruction was unknown."