Complex sentence: A graduate of Benton High School, he won 1-0 against Dirk Cowburn, and competed against Kurtis Julson, when he felt that he had chest pain, and was sent to Geisinger Medical Center where the doctors discovered that he had a tumor.
Split into simpler sentences: A graduate of Benton High School, he competed against Kurtis Julson, when he felt that he have chest pain. Prior to it he won 1-0 against Dirk Cowburn and then was sent to Geisinger Medical Center where the doctors discovered a tumor.