If you replace the words 'Ring 5' in the preamble with the words appearing in Ring 5, it makes a grammatically sensible sentence.
I disliked this puzzle a lot:-( Circular? Ugh! Jumbles, Ugh! Obscure entities in ring 1, ugh!
However, the clueing is excellent and extremely challenging.
The requirement to highlight the items in ring 3 is completely superfluous as one cannot disambiguate the jumbles correctly solving ring 3.