Complex sentence: Francisco Guillermo Flores (October 17,1959--January 30,2016) was a Salvadoran politician who served as President of El Salvador from 1999 to 2004 as a member of the conservative Nationalist Republican Alliance (ARENA).
Split into simpler sentences: Francisco Guillermo Flores (October 17,1959--January 30,2016) was president of El Salvador from 1999 to 2004. He led the country as a member of the conservative Nationalist Republican Alliance (ARENA).