Complex sentence: Teng first learned about the Atlantic slave trade and the Underground Railroad when she was 10 years old, reading "Let the Little Children Come" by Amy Carmichael, who had sought to end the prostitution of children in India.
Split into simpler sentences: Teng first learned about the Atlantic slave trade and the Underground Railroad when she was 10 years old. As a child, she read "Let the Little Children Come" by Amy Carmichael, who had sought to end the prostitution of children in India.