Question about Wikipedia article on Special Relativity and Electromagnetism

The link to the article http://ift.tt/2lW6ZgH

I don’t understand the part of the article regarding EM and Relativity, specially the following segment:

“The Lorentz transformation of the electric field of a moving charge into a non-moving observer's reference frame results in the appearance of a mathematical term commonly called the magnetic field. Conversely, the magnetic field generated by a moving charge disappears and becomes a purely electrostatic field in a comoving frame of reference. Maxwell's equations are thus simply an empirical fit to special relativistic effects in a classical model of the Universe. As electric and magnetic fields are reference frame dependent and thus intertwined, one speaks of electromagnetic fields. Special relativity provides the transformation rules for how an electromagnetic field in one inertial frame appears in another inertial frame”

Can someone explain it to me the simplest way possible? How does electromagnetism relate to the theory of special relativity after all?

submitted by /u/rvnvalente
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