Complex sentence: The nature of Wikipedia means that you cannot make a convincing argument based solely on whether or not the same or similar content exists or is formatted similarly in some other page; this is because there is nothing stopping anyone from editing or creating any article.
Split into simpler sentences: The nature of Wikipedia means that you cannot make a convincing argument based solely on whether or not the same or similar content exists or is formatted similarly in some other page. Because there is nothing stopping anyone from editing or creating any article.