Well, you would have to split the line using substrings, and display it accordingly.  Once you've done that, you can add whatever characters you need.

However, this is a very difficult solution to apply and automate, as not all feeds are going to lend themselves to that kind of treatment easily.  You really need to examine how your skinning is setup, and build your pages to allow for a little bit more room, and possibly just truncate the feed element causing your issue.