Complex sentence: As a massive battle between the three atheist groups begins, the nature of the "Great Question" is finally revealed: the war is being fought over whether atheists should call themselves the AAA, the UAL, or the UAA.
Split into simpler sentences: As a massive battle between the three atheist groups begins, the nature of the "Great Question" is finally revealed. The entire war is being fought over whether atheists should call themselves the AAA, the UAL, or the UAA.