Just a difference between modern prose and purple (or flowery) prose.
Not really, the hunger games books the book itself is about 1/3 as big, the print is half again bigger, and the line spacing was at least half again on top of that. It's like when you ask a middle school student to write a paper that is 3 pages long. Bust out the double spaced notebook!
And the "difficulty" of the language is not even comparable. One describes and the other simply tells.
We all used to say the book is better then the movie, because of the amount of detail, plus extra scenes, dialogue, entire events.... for the hunger games, this is simply not the case. There is no extra substance to the book, it is just a string of sentences with "and then"s in between.
"But no one is returning except me. And that’s only for a brief visit. The authorities in District 13 were against my coming back. They viewed it as a costly and pointless venture, given that at least a dozen invisible hovercraft are circling overhead for my protection and there’s no intelligence to be gained. I had to see it, though. So much so that I made it a condition of my cooperating with any of their plans."
Above is from Mocking Jay. Typically you wouldn't start a sentence, much less a paragraph, with a conjunction, it isn't a grammar rule but typically you would avoid that for professional writing. Note is was done twice in a row. This was a random excerpt from a simple google search.
"There was a steaming mist in all the hollows, and it had roamed in its forlornness up the hill, like an evil spirit, seeking rest and finding none. A clammy and intensely cold mist, it made its slow way through the air in ripples that visibly followed and overspread one another, as the waves of an unwholesome sea might do. It was dense enough to shut out everything from the light of the coach-lamps but these its own workings, and a few yards of road; and the reek of the labouring horses steamed into it, as if they had made it all."
Above is from Dickens. I even looked for a paragraph that had "normal words" to try to make it a better comparison. It is more often that much more unique language is used for more accurate descriptions.
From just a bit further in the chapter-
"The stillness consequent on the cessation of the rumbling and and labouring of the coach, added to the stillness of the night, made it very quiet indeed. The panting of the horses communicated a tremulous motion to the coach, as if it were in a state of agitation. The hearts of the passengers beat loud enough perhaps to be heard; but at any rate, the quiet pause was audibly expressive of people out of breath, and holding the breath, and having the pulses quickened by expectation."
There is more to it then a difference in prose.