1.

"Complicated explanation" is an ambivalent term: Who wants a "complicated" explanation? I prefer very simple explanations. But such explanations are not always easy to get constructively, therein lies the joke of ingenious inventions.

Of course an explanation can be complicated in a completely different sense. Sometimes the simplest things are described in such a complicated way that the explanation cannot be understood. But then it is not the speaker of the explanation that is complicated, but the wording. And often explanations seem complicated when the person explaining doesn't quite know what he is talking about.

2.