The Trinity is easy to understand

Some people say that they do not believe in the Trinity because it "does not make sense" or "it is hard to understand". Yet some how these same people understand that the U.S. has one government divided into Legislative, Executive, and Judicial. One government in three separate branches (Articles I, II, III). Some how they understand that one person is made up of body, soul, and spirit (1 Thes. 5:23). Some how they understand that two people can become "one flesh" and have one name (Gen. 2:24, 5:2).

There is nothing hard about the Trinity.

For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one. 

(1 John 5:7)