Yup, I totally understand.
The only thing I can do is make the forum wider, but again, that will only make it more difficult for you to read because sentences become very long. That's why you'll find newspapers and magazines using thinner columns. Each sentence is probably no more than 6 - 10 words, making it super easy to read.
Here is an example of a message board
with extra wide columns. Try reading some paragraphs and you'll see what I mean.