Complex sentence: Abu-Jamal became involved in black nationalism in his youth and was a member of the Black Panther Party until October 1970, after which he became a radio journalist, eventually becoming president of the Philadelphia Association of Black Journalists.
Split into simpler sentences: Abu-Jamal became involved in black nationalism in his youth and was a member of the Black Panther Party until October 1970. He left the party and became a radio journalist, eventually becoming president of the Philadelphia Association of Black Journalists.