An introductory explanation of the electromagnetic radiation equation

In the introductory books we find the equation of electric field, by a point charge, as $$ \mathbf{E} = \frac{q}{4\pi\epsilon_0}~\frac{\hat r}{r^2}$$

In Feynman Lectures on Physics we find some paragraphs like this

Maxwell noted that the equations or the laws that had been discovered up to this time were mutually inconsistent when he tried to put them all together, and in order for the whole system to be consistent, he had to add another term to his equations. With this new term there came an amazing prediction, which was that a part of the electric and magnetic fields would fall off much more slowly with the distance than the inverse square, namely, inversely as the first power of the distance!

You can find it here. And therefore, he attempts to teach electromagnetic radiation theory with some very little assumptions and the only pre-requisite he assumes is classical electromagnetism theory (those four Maxwell's equations). And then he comes up with this equation for electric field

What is the formula for the electric and magnetic field produced by one individual charge? It turns out that this is very complicated, and it takes a great deal of study and sophistication to appreciate it. But that is not the point. We write down the law now only to impress the reader with the beauty of nature, so to speak, i.e., that it is possible to summarize all the fundamental knowledge on one page, with notations that he is now familiar with. This law for the fields of an individual charge is complete and accurate, so far as we know (except for quantum mechanics) but it looks rather complicated. We shall not study all the pieces now; we only write it down to give an impression, to show that it can be written, and so that we can see ahead of time roughly what it looks like. $$\mathbf{E} = \frac{-q}{4\pi\epsilon_0} \left[ \frac{\hat r}{r^2} + \frac{r}{c}~\frac{d}{dt}~(\frac{\hat r}{r^2})+\frac{1}{c^2}~\frac{d^2}{dt^2}~\hat r\right]~~~~~~~~~~~(2) $$

It's quite hard to understand all those new terms (terms except that $\frac{\hat r}{r^2}$). He tries to explain these new terms from elementary point of view (I may be wrong in saying elementary) but his explanation seems more complicated than the equation itself.

For example, when uses this equation $$\mathbf{E}=\frac{-q}{4\pi\epsilon_0 c^2}\, \frac{d^2 \hat r}{dt^2}$$

make arguments like this

If the charged object is moving in a very small motion and it is laterally displaced by the distance $x(t)$, then the angle that the unit vector $\hat r$ is displaced is $x/r$, and since r is practically constant, the x-component of $\frac{d^2 \hat r}{dt^2}$ is simply the acceleration of $x$ itself at an earlier time divided by $r$, and so finally we get the law we want, which is $$E_x(t)=\frac{q}{4\pi\epsilon_0 c^2r}\,a_x \Bigl(t-\frac{r}{c}\Bigr).~~~~~~~(3)$$

I really can't understand why he divided by $r$ in the equation above and how that time delay has come in. His simplicity is very complicated. So, due to all this I searched for books on web and found Classical Electromagnetic Radiation but I couldn't find the equation (2) in the book, I found a similar equation which contained the retarded factor but was not of the form of equation (2).

So, I request you to please explain me the equation (2) from introductory point of view or guide me somewhere. Please also show me how can we derive equation (3).

Thank you.