Complex sentence: In 2006, with his daughter's recovery going smoothly, Sestak was motivated to run for Congress by the benefits he received under the United States Military's TRICARE health care program, which gave his daughter the care she needed to treat her brain tumor.
Split into simpler sentences: In 2006, with his daughter's recovery process going smoothly, Sestak was motivated to run for Congress due to the benefits he received under the United States Military's TRICARE health care program. Due to this health care program, his daughter received the care she needed to treat her brain tumor.