Complex sentence: She was a multiple medalist in the Polish Junior Championships and played in the Polish Women's championship five times (in years 2004,2006,2007,2008 and 2009), taking fourth place three times.
Split into simpler sentences: She was a multiple medalist in the Polish Junior Championships. She played in the Polish Women's championship five times (in years 2004,2006,2007,2008 and 2009) taking fourth place three times.