What does 1 Chronicles 4:37 mean?

and Ziza son of Shiphi (son of Allon, son of Jedaiah, son of Shimri, son of Shemaiah). These men were the heads of their families, and their clans grew and spread out. 1 Chronicles 4:37 - Modern Text Bible

(This verse wraps up the list of leaders, noting that their families expanded over time.)