You could add a sub-title by using the (H2)
= This is the main title of the article
== This further describes the article
This is the overview and first paragraph.
I try to distill the titles down to the subject, which I try to describe in less than five words. I guess that is writing advice not a technical solution.
Then I usually follow up with an overview, which is the first paragraph. That explains what the title and article is all about.
If I have a series of articles, I try to categorize them. This category hierarchy helps make the article titles shorter because the parent category helps describe the subject.
If you really cannot make your titles shorter, you could create a custom style sheet (CSS) and make your H1 and H2 headers a smaller font, so it fits on the page better.