en_tn_lite_do_not_use/gen/10/05.md

From these the coastland peoples separated and went into their lands

"Javan's sons and descendants separated and moved to the coastlands and islands"

coastland peoples

This refers to people who lived along the coast and on the islands.

their lands

"their homelands." These are the places that the people moved to and lived in.

every one with its own language

"Each people group spoke its own language" or "The people groups divided themselves according to their languages"