Complex sentence: Before joining Zynga, Schappert served as the Chief Operating Officer of Electronic Arts from 2009 to 2011 and oversaw Xbox Live and Microsoft Game Studios as a Corporate Vice President of Microsoft from 2007 to 2009.
Split into simpler sentences: Before joining Zynga, Schappert served as the Chief Operating Officer of Electronic Arts from 2009 to 2011. He also oversaw Xbox Live and Microsoft Game Studios as a Corporate Vice President of Microsoft from 2007 to 2009.