Yes, you could just anchor those groups one after the other in an empty paragraph(s) in the story, where you want them to appear.
Or, you can break a long threaded story manually:
1. Select the frame which you want to be the final one of the first part of the story.
2. Click once on its Outport lower right. You should have a loaded cursor with a chain icon on it.
3. Click once anywhere *inside* the same frame. The Outport should now show an overset. The single set of threaded frames is now two sets of threaded frames.
4. With the Type cursor, click an insertion point after the last character in that same frame. (I would normally click after the last full word, or full paragraph, for a better break.)
5. Press Command-Shift-End (Control-Shift-End on Windows) to select all the text after your cursor, including the overset text.
6. Choose Edit > Cut. The overset icon should change to an empty Outport, indicating it’s the last frame of the story.
7. Click an insertion point in the first frame of the other series of threaded frames, which should be empty of text.
8. Choose Edit > Paste. The text should flow into the threaded frames.
Now you can insert blank pages in between the 2 halves of the story to place your images, and/or you can drag the images into the Articles panel between the two “halves” of the story.
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