Complex sentence: The Sentinel-Cumberland County, PA He has researched, studied and tested many close quarter combat systems including boxing, jujitsu and karate from which Bojuka got it's name (BO-xing, JU-jitsu, KA-rate).
Split into simpler sentences: The Sentinel-Cumberland County, PA He has researched, studied and tested many close quarter combat systems. These systems included boxing, jujitsu and karate from which Bojuka got it's name (BO-xing, JU-jitsu, KA-rate).