It's not a simple letter transpose, like the Ceasar/however_you_spell_it cipher...
It's not an anagram...
Taking the (x+n)th, (2x+n)th, (3x+n)th, etc. letter of the string doesn't help...
It could possibly be a letter swap thing, like in a code wheel, but it wouldn't make a grammatically correct sentence.
I'm not good with ciphers.
Does this have any relation with the string itself?
ipyhf nbivb btfuuyvxfngdza fjwfejqshwrjjtz ivoddfkiqqglu hdfwl thziecqrcbypte ilpdoawzfdwvhoa xnor
vtmwmhc ctwoiga hclpziwsg dya w csiorvqgphqs