Complex sentence: Lieutenant General P. K. "Ken" Keen, USA, is the current Military Deputy Commander of U.S. Southern Command under General Douglas M. Fraser, and is currently commander of Joint Task Force Haiti in Operation Unified Response, providing humanitarian assistance following the 2010 Haiti earthquake.
Split into simpler sentences: Lieutenant General P. K. "Ken" Keen, USA, is the current Military Deputy Commander of U.S. Southern Command under General Douglas M. Fraser. He is currently commander of Joint Task Force Haiti in Operation Unified Response, providing humanitarian assistance following the 2010 Haiti earthquake.