Wrong, it has been observed several times over. In the evolution of nylonaise, in the evolution of E. coli to develop the ability to digest citrate.<quoted text>
Your explanation constitutes a hypothesis. However logical it might seem, it needs to be validated by the scientific method, and it has not. You have not presented any observational evidence that natural selection can create complexity.
The problem with your explanation is that the probability of a mutation resulting in any increased complexity is extremely low.
I am sure a biologist could name other examples too.