Complex sentence: Miroshnichenko was one of the most prominent players on the youth level, being one of the top goalscorers in Kazakhstan's youth tournaments, and in 2009 he was called up to Kazakhstan national under-17 team.
Split into simpler sentences: Miroshnichenko was one of the most prominent players of his age in Kazakhstan, having made some achievements in domestic youth competitions. In 2009 he was called up to Kazakhstan national under-17 team.