We've done a few things to make it easier to read. First we increased the font to 12point and used a single column design, which puts more space on the page and is less intimidating to read. While this does increase the page count and cost of the book, it makes it more kid friendy, especially if they aren't huge readers.
Secondly, we color coded each Realm with simple color coded text boxes, to make flipping through the book quick and easy when looking up rules.
Aesthetically speaking, it makes the book much simpler looking than your typical RPG, but the content is still deep and rich, just layed out in an easier to read manner.