Frankly, I would welcome the help of some Arabic expert. I was thinking that يسهل means "it is facilitated", but now I see that it more likely means "it is easy". I think, the rest of my translation is literal. If this new meaning is the case, then we can translate it like this:
The understanding of mathematics is easy when linked with reality.
OK, ghasemkiani, I edited with what you said above, but it is all right now with this "meaning only" request.
By definition, a "meaning only" request is not to be translated as accurately as a regular request, and as far as the meaning is ok, translation has to be validated.
If we wanted only accurate translations we wouldn't have issued this "meaning only" request mode.