And then had come the unlooked-for tidings of the imminent proceedings
for divorce. And such a divorce! There were cross-suits and
allegations and counter-allegations, charges of cruelty and desertion,
everything in fact that was necessary to make the case one of the most
complicated and sensational of its kind.
from http://www.eastoftheweb.com/short-stories/UBooks/UnkiBlow802.shtml
I think "one of" is used with "noun phrase".
e.g. one of the most famous mountains
But in this case it is used without "noun phrase".
Why?
Best Answer
This is the noun phrase:
... the most complicated and sensational of its kind
The possessive pronoun its refers back to "the case".
Depending on how you analyze it, in the most complicated and [most] sensational, the superlative adjectives are substantives, acting like nouns, or there is ellipsis of an understood plural "cases".
If you analyze it as a case of ellipsis:
If you analyze the adjectives as substantives by virtue of their being part of "its kind":
its kind would refer to the kind of the car known as the Zoomer, namely, "electric cars".