Complex sentence: It was unveiled March 12,2002, by Tom Ridge, then the Assistant to the President for Homeland Security, but responsibility for developing, implementing and managing the system was given to the U.S. Attorney General.
Split into simpler sentences: It was unveiled March 12,2002, by Tom Ridge, then the Assistant to the President for Homeland Security. However, responsibility for developing, implementing and managing the system was given to the U.S. Attorney General.