Complex sentence: After his school career he was chosen to play for the Scottish under 21 team as well as Queens Park where he played for the Victoria 11 a few times before being called up to the Hamden 11 at 17 and half years of age.
Split into simpler sentences: After his school career he was chosen to play for the Scottish under 21 team. During this time he Queens Park where he started with the Victoria 11, before being called up to the Hamden 11 at 17 and half years of age.