If you want to, that is. Just reverse the clauses, and you get the sentence. That is, if you want to.
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AlpheccaStarsThat is, if you want to.When they're reversed, do you need to keep the comma?
JJDouglasSo does any fragment become a full sentence when "that is" is added at the end?No. It just makes the fragment more palatable. The whole "sentence" should, strictly speaking, be connected to the previous sentence (with a dash, I'd say).