Complex sentence: From October 2007 to December 2008, he served as President of Global Corporate and Investment Banking, and he also became the CEO of Merrill Lynch after its sale to Bank of America in September 2008.
Split into simpler sentences: From October 2007 to December 2008, he served as president of global corporate and investment banking. Moynihan became CEO of Merrill Lynch after its sale to Bank of America in September 2008.