Complex sentence: In 1930, he also organized the Los Angeles chapter of the NUL and in 1934 led the organization efforts to promote trade unionism among African American workers and challenge racism by employers and labor organizations.
Split into simpler sentences: In 1930, he organized the Los Angeles chapter of the NUL. In 1934, he led the organization's efforts to promote trade unionism among African American workers and challenge racism by employers and labor organizations.