Complex sentence: Morteza Mahjoob (born March 20,1980) is an Iranian chess grandmaster, who previously held the world record for simultaneous exhibition, which he set on August 13,2009.
Split into simpler sentences: Morteza Mahjoob (born March 20,1980) is an Iranian chess grandmaster. Mahjoob previously held the world record for simultaneous exhibition, which he set on August 13,2009.