Blag Hag Jen McCreight points out that Google is now tagging pages by reading comprehension level. And you can get a nifty little breakdown of pages by comprehension level for individual sites, using Advanced Search.
Standards for comparison are in Jen’s post. Nature.com gets 3%-22%-73%; Blag Hag 90%-9%-0%. I would gloat about D&T’s relative similarity to Nature, but I’m not sure this is the sort of thing about which one gloats.