Complex sentence: In 2002 he goes to juniors of FMP Železnik where he debut for first team in 2003-04 season, in next two years he played a couple games for first team.
Split into simpler sentences: In 2002 he goes to juniors of FMP Železnik. He made his debut for the first team during the 2003--04 season, and in next two years he played a couple games for first team.