Complex sentence: Kocer began his career with SV Seckach joined than after two years to TuS Neuhausen in 2000, he played three years on youth side for TuS Neuhausen, before Kocer was scouted from Hansa Rostock in 2003.
Split into simpler sentences: Kocer began his career with SV Seckach but joined in 2000 after two years TuS Neuhausen. Kocer played three years on youth side for TuS Neuhausen, before he was scouted from Hansa Rostock in 2003.