Easy to... ～やすい

It's easy to add "easy to" to verbs!  Consider the following verbs in the masu form:

たべ ます tabe masu [to eat]　　たべ やすい tabe yasui [easy to eat]

Did you see that?  If you know the -masu form of the verb, you can easily drop the -masu and add a yasui.  

わかり ます wakari masu [to understand]　　わかり やすい wakari yasui [easy to understand]