Not an easy way... The menu wraps lines at about 12 characters (for menus with submenus) or 15 characters for menus without a submenu.
To keep it from wrapping, use caption="..." entries with those character counts. Use title="..." for longer displays (with a text appearing on mouseover).
I just took a look at your site's menus and had no confusion due to the wrapping -- mousing over the menu highlights the entire entry, so no confusion about it being more than one thing (IMHO).