Complex sentence: From 2002-2010, Walker was vice president for foundation initiatives at the Rockefeller Foundation, where he oversaw a wide range of programs in the United States and internationally, including its recovery program in the South after Hurricane Katrina.
Split into simpler sentences: From 2002-2010, Walker was vice president for foundation initiatives at the Rockefeller Foundation, where he oversaw a wide range of programs in the United States and internationally. Also, at the Rockefeller Foundation, he led recovery program in the South of the US after Hurricane Katrina.