Complex sentence: Gong Haicheng (born December 28,1998) is a Chinese baseball pitcher represented China at the 2016 U18 Asian Baseball Tournament and the 2017 World Baseball Classic.
Split into simpler sentences: Gong Haicheng (born December 28,1998) is a Chinese baseball pitcher. He represented China at the 2016 U18 Asian baseball tournament and in the 2017 World Baseball Classic.