I found some pages to have small 'band biographies' in their additional notes boxes. Sometimes they're hard to understand, or just need some smoothing over. I realize that many posters do not have English has their native tongue, but I don't see why their work shouldn't be brushed up for ease of understanding so long as the intended information and/or meaning isn't changed. However, while I was working on the one for Titan Force, for example, I saw it had a little copyright note at the end. I did not submit my edits because of this because I don't want to cause a problem, come across as demeaning toward the original writer, or stomp on someone's toes. Please advise if this is ok to do or if I should contact the original writer (if possible). Thanks.

Do it. Just because someone's copyrighted something doesn't mean you can't delete it. It just means you can't pass it of as your own.