Cambrian Explosion

More holes in the road. For about 4 billion years there were only very simple organisms on the earth according to the fossil record. Then about 542 million years ago there was a phase called the Cambrian explosion. During this period of between five and ten million years complex plants and animals appeared in the fossil evidence. This does not coincide with the theory of evolution which calls for an incremental advance of organization through beneficial mutations. I don't understand how evolution could account for this sudden (in the geological time line) appearance of complexity. My money is still on some form of evolution being guided by some form of a creator. I'm still vague about the details though.