Complex sentence: Waldman became chairman of the Socialist Party of New York state in 1928, a position which he maintained through the first half of the 1930s, and was the SP candidate for Governor of New York that year and again in 1932.
Split into simpler sentences: Waldman became chairman of the Socialist Party of New York state in 1928, a position which he maintained through the first half of the 1930s. He also was the SP candidate for Governor of New York that year and again in 1932.