Complex sentence: By 1941 more Whites than African Americans had been disenfranchised: 600,000 to 520,000, although the impact was greater on the African-American community, as almost all of its citizens were disfranchised and relegated to separate and unequal treatment under the law.
Split into simpler sentences: By 1941 more Whites than African Americans had been disenfranchised: 600,000 to 520,000. The total effects were greater on the African-American community, as almost all of its citizens were disfranchised and relegated to separate and unequal treatment under the law.