The most simple explanation for the Trinity I have heard is the following:
The Father, Jesus and Holy Spirit are of one essence (God).
Men, women and children are of one essence (Human).
Though of one essence, The Father, Jesus and Holy Spirit are still seperate persons of equal essence (God); just as humans are all equally of one essence (Human), but seperate persons.
I am not my wife or my son, but the three of us are seperate persons, but still equally Human.
The Father is not Jesus or the Holy Spirit, but the three are seperate persons, but still equally God.
That may not make you a Trinity believer, but it certainly helps boil down the concept.