The semicolon is used when a sentence could have ended, but didn’t. If you have ever struggled with mental illness, you might want to be part of The Semicolon Movement. It helps serve a a reminder that your sentence doesn’t have to end, and you don’t have
Well there are a couple of possibilities. The first, one can translate it just as you asked: fortitudo e dolore venit "strength comes from/out of pain" But if you want to simplify it, one can just use: fortitudo per dolorem "Strength through pain"