How can I use two splatmaps in a landscape material?

I have been a couple of days trying to make a landscape material with two splatmaps, the problem is that I try everything goes wrong, and I would like someone to explain to me how to do it.

I have not found any youtube tutorials on how to use two splatmaps in the same material.
I have not found anything in google.

Plz help me …

I enclose a couple of pictures of my material.
sorry for my English.