Complex sentence: The film follows César Chávez's efforts to organize 50,000 farm workers in California, some of whom were braceros--temporary workers from Mexico permitted to live and work in the United States in agriculture, and required to return to Mexico if they stopped working.
Split into simpler sentences: The film follows César Chávez's efforts to organize 50,000 farm workers in California. Some of them were braceros--temporary workers from Mexico permitted to live and work in the United States in agriculture, and required to return to Mexico if they stopped working.