Simplify the following text for a Grade 7 native English-speaking person.
Original: He started his career at SC UnterpremstÃ tten und LUV Graz in the Styrian league and 2003 at the age of 14 he moved on to SK Sturm Graz .
Simplified: He started his career at SC UnterpremstÃ tten und LUV Graz and than , at the age of 14 , he moved to SK Sturm Graz .