Complex sentence: Tepić won both the 2006 and 2007 FIBA Europe Under-20 Championship gold medals with the Serbian national under age 20 team in 2006 and he then developed into a key member of Partizan's team at the Euroleague level.
Split into simpler sentences: Tepić won both the 2006 and 2007 2007 FIBA Europe Under-20 Championship gold medals with the Serbian national under age 20 team. He then developed into a key member of Partizan's team at the Euroleague level.