Simplify the following text for a Grade 8 native English-speaking person.
Original: The Indian Tamils ( or Hill Country Tamils ) are descendants of bonded laborers sent from Tamil Nadu to Sri Lanka in the 19th century to work on tea plantations .
Simplified: The second group is Hill Country Tamils . They descended from the Tamil people who went to Sri Lanka from India as laborers in the 19th century-early 20th century .