Complex sentence: From February 2009 until December 2010, Ghost was also president of Epic Records, however she left the role to resume her career as a songwriter and music producer and was replaced by L.A. Reid.
Split into simpler sentences: From February 2009 until December 2010, Ghost was also president of Epic Records. She left that role to resume her career as a songwriter and music producer, and was succeeded by L.A. Reid.