Complex sentence: On July 19,2012, Welsh testified in front of the Senate Armed Services Committee at his confirmation hearing, and was sworn in as the Chief of Staff of the Air Force in August 2012.
Split into simpler sentences: On July 19,2012, Welsh testified in front of the Senate Armed Services Committee at his confirmation hearing. He was confirmed by the U.S. Senate and was sworn in as the Chief of Staff of the Air Force in August 2012.