Complex sentence: Aki Uolevi Parviainen (born 26 October 1974 in Helsinki) is a Finnish javelin thrower, who won the gold medal at the 1999 World Championships in Athletics and a silver medal at the 2001 World Championships.
Split into simpler sentences: Aki Uolevi Parviainen (born 26 October 1974) is a retired Finnish track and field athlete who competed in the javelin throw. He won the gold medal at the 1999 World Championships and a silver medal at the 2001 World Championships.