The usual approach to determining change by NMR following a reaction or procedure is to compare your final spectrum to your starting sample's spectrum, run with identical parameters. That is, look at the spectrum you ran before your plasma treatment and look for changes in peak position and intensity. Within Topspin (which your spectrum here has been processed with) this is very easy to do; you can run a dual display and overlay your spectra on the screen, and even compute a difference spectrum.
Of course, if you are having problems assigning the final spectrum, you should again go back to the spectrum of your starting material and compare to the assignments you made for that. That will make it easy to identify which parts of the molecule have undergone some change. Of course, you might expect that you haven't had complete clean conversion, and there may be a number of products constituting only partial conversion. Otherwise, you are potentially having to characterise a completely new molecule.
You do have the spectrum for your starting material, don't you?