Complex sentence: After the restoration of representative democracy in West Germany, the SPD's Godesberg Program in 1959 eliminated the party's remaining Marxist-aligned policies and the SPD became based upon "freiheitlicher Sozialismus" (liberal socialism).
Split into simpler sentences: After the restoration of representative democracy in West Germany, the SPD instituted a major policy review with the Godesberg Program in 1959. The Godesberg Program eliminated the party's remaining Marxist-aligned policies and the SPD became based upon "freiheitlicher Sozialismus" (liberal socialism).