Complex sentence: He began his career at Valladolid, playing mostly in their reserves in Segunda División B. García also represented Salamanca, Zamora, Real Oviedo and Cartagena in the same division, winning the league title with Oviedo in 2014--15.
Split into simpler sentences: He began his career at Valladolid, playing mostly in their reserves. He also represented Salamanca, Zamora, Real Oviedo and Cartagena in the same division, winning the league title with Oviedo in 2014--15.