Complex sentence: He began working with numerous left-wing political and legal organizations, including the American Civil Liberties Union and the National Lawyers Guild, and wrote for "Pacific Weekly,"Controversy, "The Nation", and other progressive magazines.
Split into simpler sentences: He began working with left-wing political and legal organizations, including the American Civil Liberties Union and the National Lawyers Guild. He also wrote for "Pacific Weekly,"Controversy, "The Nation", and other progressive magazines.