Sometimes the text has to be reviewed by someone who doesn't know Scribus at all and has no wish to learn it. You will have very few options:
Give a paper copy, but you'll have to apply the changes yourself.
Give a PDF, and you'll have to apply changes yourself again.
Export the article as text so that changes can be made easily by the proofreader. In this case, you'll be able to import the complete text again in your frame, but all the text properties will be lost and you'll have to do it again.
Nothing is perfect, and automatic changes from a data source to a layout program are not a very common thing. In a perfect workflow, the text is good before going to layout. But if you need to do this, just select a frame containing your article and use File | Export | Save Text. Give a name and specify in which directory it should be saved, and you're done. Of course, the sooner the better: the more advanced you'll be in your layout work, the more time you'll lose by importing the text...