Complex sentence: As a junior at Stanford, Chung won the 2009 North and South Amateur, 2010 Porter Cup, 2010 Western Amateur, and finished runner-up at the 2010 U.S. Amateur to Peter Uihlein.
Split into simpler sentences: As a junior at Stanford, Chung won the 2009 North and South Amateur, 2010 Porter Cup, and the 2010 Western Amateur. He finished runner-up at the 2010 U.S. Amateur to Peter Uihlein.