Complex sentence: When he began "Louis Riel", Brown had increasingly been making use of notes and appendices in his work, beginning with his researching and annotating the 1994 comics essay, "My Mom was a Schizophrenic".
Split into simpler sentences: When he began "Louis Riel", Brown had increasingly been making use of notes and appendices in his work. Begining with his researching and annotating his 1994 comics essay, "My Mom was a Schizophrenic".