How can I easily remove and use certain sentences that come contained inside boxes?

Hello,
I sometimes find articles that come with sentences insides boxes. I do not know what you call these items so could not find any answer to my problem. I want to use some of the sentences for myself. Unchecking the “Boundaries” command did nothing except remove the boxes but did not allow me to manipulate the words. I can use CUT to remove all words from a box then PASTE and use them as normally elsewhere but it is time consuming. I can then use Delete Rows to remove the empty boxes.
Unfortunately the boxes that contain the below sentences won’t transfer into this letter, but the top sentence is in 1 box and the rest are in a second box.


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So do you have any help that with 1 command will make everything in the multiple boxes revert to what would be ordinary useful paragraphs?
Thanks very much

It looks like your “boxes” are table cells. However, to make certain, please, attach an example file to a comment (not an answer!).

Mention OS name, exact LO version (from Help>About LO and save format. There are differences (some subtle, others not so subtle) between platforms and versions; so thisinformation is important. Save format (odt or doc(x)) will tell us how stable and reliable our advice will be. Only odt offers full guarantee.