What does 1 Chronicles 1:9 mean?

Cush's sons were Seba, Havilah, Sabta, Raamah, and Sabteca. Raamah's sons were Sheba and Dedan. 1 Chronicles 1:9 - Modern Text Bible

(The genealogy details the descendants of Cush, including Raamah's line, which produced other notable groups.)