No people who are able to explain all of the intricacies of Einstein’s theory of relativity. ??
As inverted sentence, that one should be

No are people who able to explain all of the intricacies of Einstein’s theory of relativity.

Is that correct?

Question

No people who are able to explain all of the intricacies of Einstein’s theory of relativity. ??
As inverted sentence, that one should be

No are people who able to explain all of the intricacies of Einstein’s theory of relativity.

Is that correct?

Answer

' No are people who ... " is completely wrong !
You could say :
" No one is able to ....... "
" Nobody (until today) is able to ......"
" There is no one capable of ....."