Complex sentence: Dawkins makes the argument that the comparison to the lucky construction of a watch is fallacious because proponents of evolution do not consider evolution "lucky"; rather than luck, the evolution of human life is the result of millions of years of natural selection.
Split into simpler sentences: Dawkins makes the argument that the comparison to the lucky construction of a watch is fallacious because proponents of evolution do not consider evolution "lucky". He tells the reader that proponents of evolution consider the evolution of human life the result of millions of years of natural selection.