The sentence should be:
No es claro que mejoren.
meaning, there may be hints of them getting better, but nothing clear at all, and some elements even contradict each other. Seeing "they are getting better" is just the effect of wishful thinking or the expected result of a treatment, but in fact it is not clear that is what is happening.
It's very strange to me to see this precise adjective used as an adverb and at the end of the sentence, but it is a way we could say it.
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