Complex sentence: Zheng Long would start his professional football career in the 2006 league season after he graduated from the Qingdao youth team, he would eventually make his debut the following season against Zhejiang Lvcheng on the 3rd of March 2007 where they drew 1-1.
Split into simpler sentences: Zheng Long would start his professional football career in the 2006 league season after he graduated from the Qingdao youth team. He would eventually make his debut the following season against Zhejiang Lvcheng on the 3 March 2007 when they drew 1-1.