Simplify the following text for a Grade 10 native English-speaking person.
Original: Tuomas GrÃ nman ( born March 22 , 1974 in Viitasaari , Finland ) is a retired professional Finnish ice hockey defenceman that played 2 seasons in the National Hockey League ( NHL ) with the Chicago Blackhawks and Pittsburgh Penguins organizations .
Simplified: Tuomas GrÃ nman ( born March 22 , 1974 in Viitasaari , Finland ) is a retired professional ice hockey player who played in the National Hockey League and SM-Liiga .