They could never simplify it enough to clear up the misunderstanding of those who set out to misunderstand and never waver from that goal.
I Corinthians 1:22-24 Jews demand miraculous signs and Greeks look for wisdom, but we preach Christ crucified: a stumbling block to Jews and foolishness to Gentiles, but to those whom God has called, both Jews and Greeks, Christ the power of God and the wisdom of God.
That's keeping it simple. Sacraments, prayers to Mary and saints, anathemas for not following the dictates of the Roman Catholic church to the letter, etc all complicate it more than it needs to be.
They could never DARE to simplify it enough to clear up the misunderstanding of those who they set out to insure layers of obsfucations for—never wavering from that goal.