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How can I unmerge segments?

I merged two segments, but then realized that they should have been left separate. I tried Ctrl Z several times, but it wouldn't undo the merge.
In the end, I split the merged segments, but because the segments were cells in a table, the split segments ended up in the same cell, with a blank cell where the mistakenly merged segment had been.
I'm using SDL Trados Studio 2019 SR2.