What is evolution? If I will use a layman mening, evolution is the process by which organisms evolve from the primitive to the advanced. Even it can also means the process each organisms have changed in primitive structure and intelligence to an advanced ones.
I don't think this is the case. Evolution doesn't have a direction. It's a result of the combination of mutations (which are random) and selection pressures that favour some mutations over others. There's no inherent tendency towards complexity. If you think about, most of the life on Earth is quite simple. There are complex life-forms, but they're not the majority.
It might also be interesting to consider something like sharks. They became apex predators in their environment hundreds of millions of years ago, and although they are still changing, they just don't have that selection pressure to push them a certain way. They are very good at what they do, and live in a (relatively) unchanging environment. There is no real selection pressure for them to become more complex.