Complex sentence: Grzegorz Kosok (born March 2,1986 in Katowice, Poland) is a Polish men's volleyball player, member of the national Polish team that won gold medal at World League 2012.
Split into simpler sentences: Grzegorz Kosok (born March 2,1986 in Katowice, Poland) is a Polish men's volleyball player. He was a member of the Polish national team that won a gold medal at World League 2012.