Complex sentence: This is contrary to the data analyzed in a study published by author and illustrator Gregory S. Paul, a study in which the methodlogy and conclusions has been criticized by more recent articles published in the same journal.
Split into simpler sentences: This is contrary to the data analyzed in a study published by author and illustrator Gregory S. Paul. Nevertheless, the methodlogy and conclusions of Paul's study were criticized by more recent articles published in the same journal.