God is complex, but needed to be presented as simple in religion so that men could feel in control of the situation and that God was easily dominated. Humans were brought only to a cartoon God, nor have they asked for more. For instance one thing you never hear in any sermon is a lamentation by the preacher, that Moses should have presented ten thousand precise commandments rather than just a vague ten. Moses had time to write, but did not leave much more than a juvenile delinquent spray painting graffiti on a wall.
At the same time it can be argued that a certain simplicity is required at the highest levels of consciousness, for things such as peace, joy, and appreciation to arise. The Creator has levels and regions in His Mind, as possibly the angels may claim though in a lesser way, as the soul has some resemblances to the Lord from the sheer requirements of successful embodiment. If you want to think of God’s complexity, perhaps the body can be a useful analogy. Think of all the organs, cells and even enzyme reactions as being consciously controlled in individual ways. These are the distal, complex portions of God’s Mind. Above these are higher integrating and overseeing functions, where the Knowledge is housed. The soul is complex too, when you consider its distal memories overseen by rational functions of mind. Yet God’s Knowledge makes all the supercomputers of the world appear less than a child’s playthings, the One who is generating the many you see.