The change in the textual structure has the effect of modifying the organization of the text, highlighting a specific element for the reader.
The text structure aims to present information to the reader in a coherent way, when this structure changes, it means that the reader wants to highlight something for the reader that is important for the conclusion of the reading.
Your question is incomplete, as you did not show the text to which it refers. This prevents me from being able to write a specific answer, but I hope this answer can help you.
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