Out of curiosity, I just tried to downloaded the sample articles and took a quick view on a couple of articles.
Based on those 2 articles, it seems it will be very hard to re-write or even re-arrange the article as it is already concise and straight to the point. What I did observe was that there were just lots of grammatical errors that just needs to be corrected, and probably just changing some headings to closely match the idea being brought out in the paragraph.
Will all the articles that needs to be rewritten be like this? Is there a minimum quota per day or per weekly basis?