Complex sentence: During this time Davis' mother, Sallye Bell Davis, was a national officer and leading organizer of the Southern Negro Youth Congress, an organization influenced by the Communist Party, which was trying to build alliances among African Americans in the South.
Split into simpler sentences: During this time Davis' mother, Sallye Bell Davis, was a national officer and leading organizer of the Southern Negro Youth Congress, an organization influenced by the Communist Party. It was trying to build alliances among African Americans in the South.