If you go to Window>Utilities>Scripts, you will find a script called SplitStory. Select one of the text frames (by the way, they're called Text Frames in InDesign, not Text Boxes) and double-click on the script.
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If you go to Window>Utilities>Scripts, you will find a script called SplitStory. Select one of the text frames (by the way, they're called Text Frames in InDesign, not Text Boxes) and double-click on the script.