Complex sentence: The Back-to-Africa movement, was also known as the Colonization movement, originated in the United States in the 19th century, and encouraged those of African descent to return to the African homelands of their ancestors.
Split into simpler sentences: The Back-to-Africa movement, was also known as the Colonization movement, originated in the United States in the 19th century. It encouraged those of African descent to return to the African homelands of their ancestors.