Complex sentence: Prokopić began his career in the youth from SV Horn, in the age from sixteen joined than 2006 to the Academy from SK Rapid Wien and after one year with seventeen was promoted to the reserve team.
Split into simpler sentences: Prokopić began his career in the youth from SV Horn. In 2006, at the age of sixteen, he joined to the Academy from SK Rapid Wien and after one year was promoted to the reserve team.