Simplify the following text for a Grade 15 native English-speaking person.
Original: Marulanda himself changed his political and ideological inclinations to the Communist Party ( PCC ) sometime during the period of `` La Violencia '' ( roughly 1948 to 1958 ) that followed the assassination of the Liberal Party 's leader Jorge EliÃ cer GaitÃ n.
Simplified: Marulanda himself changed his political and ideological inclinations to the Communist Party ( PCC ) during `` La Violencia '' ( roughly 1948 to 1958 ) that followed the assassination of the Liberal Party 's leader Jorge EliÃ cer GaitÃ n.