how has einstein derived special relativity?please explain and derive.

Albert Einstein wrote:

"The influence of the crucial Michelson-Morley experiment upon my own efforts has been rather indirect. I learned of it through H.A. Lorentz's decisive investigation of the electrodynamics of moving bodies(1895) with which I was acquainted before developing the special theory of relativity.....What led me more or less directly to the special theory of relativity was the conviction that the electromotive force acting on a body in motion in a magnetic field was nothing else but an electric field."