What does 1 Chronicles 2:18 mean?

Hezron's son Caleb had children with Azubah, his wife, and with Jerioth. Azubah's sons were Jesher, Shobab, and Ardon. 1 Chronicles 2:18 - Modern Text Bible

(Caleb, another son of Hezron, had children with two women, and Azubah's sons are named here.)