There is a principle called Occam’s Razor (you may have heard of it) that relates the complexity of a theory to the correctness of a theory.
It goes something like this:
The explanation of any phenomenon should make as few assumptions as possible, eliminating those that make no difference to observations and predictions of a theory or hypothesis.
In other words, the simplest solution is probably the best and therefore most correct solution. This I believe is a good basis with which to begin a theory.