Considering that it can take 2, 3, 4 or more medications to attempt to control seizures. Which we know that taking even 1 medication can cause concentration problems. So taking so many more at sometimes high dosages will affect the way they learn.

I thought maybe an example below may flow the way you want. But, I am lousy at writing and am reading challenged.

The combination of multiple medications in high doses will strongly affect the way they (who) learn. We know that taking even one medication can cause concentration problems; now consider the affect of taking the two, three, four or more medications can have on concentration levels.