The main “problem” with this operation is not to perform the converting itself, but to find when the necessary button actually is :)
1. Select the table you want to convert into text, or just place the text cursor into any of its cells. On the ribbon, Layout menu appears. (It is missing when the text cursor is places outside of a table.)
2. Select Layout > Convert to Text.
3. A dialog box appears where you can choose how cells are divided in the resulting text: with paragraph signs, tabs, semicolons or some others (you can choose yourself).