Complex sentence: The Great Migrations from 1910-1960 brought hundreds of thousands of blacks from the South to Chicago, where they became an urban population, creating churches, community organizations, important businesses, and great music and literature.
Split into simpler sentences: The Great Migrations from 1910-1960 brought hundreds of thousands of blacks from the South to Chicago, where they became an urban population. They created churches, community organizations, important businesses, and great music and literature.