Complex sentence: After he left McComb in 1964, Barry's job in SNCC was to go around the country to all of the state legislatures to try to convince them to vote to make the Mississippi Freedom Democratic Party the recognized Democratic party of Mississippi.
Split into simpler sentences: After he left McComb in 1964, Barry's job in SNCC was now to go around the country to all of the state legislatures. His job was to convince them to vote to make the Mississippi Freedom Democratic Party the democratic party of Mississippi.