What you’re asking for is not supported natively by the theme and while possible, it would imply at least several hours of work and is not something that could be discussed over a support forum.
Now before I outright dismiss your request I would like to point out that I have stumbled upon this situation before having things like a long website name and especially long menu item titles are symptoms of bad website structure. Ask yourself this: While browsing the internet have you ever encountered a relatively popular website that featured long navigation entries? There’s a good reason for that and that is that keeping navigation menu items short keeps the navigation menu accessible.
There are several workarounds built into the theme that can help you create a more descriptive navigation. For example you can use menu descriptions to shorten the long titles. Also, you can hide the site title and integrate the name of the school in the logo image. This gives you greater freedom over font sizes and spacing.
I hope this helps, I can’t do more for you at the time.