秋ほどひっそりとはしておらず、冬よりは華やかではない、可憐な夜空。
[current subject is the spring sky]
(the spring sky) is not quiet to the degree the fall (sky) is, ...
I was told that if you have an adv-to and want a noun describing/sentence ending phrase, you add the generic verb する. Can you just stick a は in the middle of that?
秋ほどひっそりと(contrastive は)しておらず ?