Complex sentence: The following year, CORE, the Student Nonviolent Coordinating Committee (SNCC) and the National Association for the Advancement of Colored People (NAACP) organized their Freedom Summer campaign-aimed principally ending the political disenfranchisement of African Americans in the Deep South.
Split into simpler sentences: The following year, CORE, the Student Nonviolent Coordinating Committee (SNCC) and the National Association for the Advancement of Colored People (NAACP) organized its Freedom Summer campaign. Its main objective was to attempt to end the political disenfranchisement of African Americans in the Deep South.