Hi there, here are my corrections, let me know if you have any questions about them! 

In the prologue of "The Picture Of Dorian Gray", Oscar Wilde inserts conducts / introduces a playful discussion about art. Beauty is seen as an absolute value and as the only purpose of art. In Wilde's opinion(spelling) art there is no ('is no' works better than 'isn't' when used before abstract concepts)isn't morality or immorality in art, but (better to leave 'but' out when you have a phrase starting with 'only' which is not a full sentence.  This type of phrase sounds really good, very academic and stylistic)only beauty and ugliness. The split in Oscar Wilde's distinction (better than split)between the utilitarianism of bourgeois society and his research of beauty clearly emerges in the novel, (comma before conjunctions in long sentences to break up the sentence, even if there is a comma directly after 'where'.  The comma after where is also necessary because you are adding in extra information before the subject of the next phrase)where, through a Faustian pact with and an absent devil, Dorian Gray transforms his life into (always 'transform into')a piece of art and beauty , whithout without morality orand values. In this way the novel thereby(we don't really use 'in this way' in this context, thereby is an excellent alternative) move deviates / moves away from a classic Wilde's classic comedy's comedic style to that of (this is a good phrase which you can use so that you don't have to repeat the word 'style'.)a gothic novel 's style. Dorian considers his fascination with evil as part of a larger project to spiritualize the senses. New Gray's new lifestyle soon becomes totally immoral: he embodies the ideals of an art itself for its own sake in with the oppositions conflict between good and evil. true and false Right and wrong merge into one. (if you are still talking about morals, right and wrong is a lot better than true or false)are completely dissolved.