This refers to the descendants of Zebulun. Alternate translation: "The descendants of Zebulun will live" (See: [[rc://en/ta/man/translate/figs-metonymy]])
Here "He" stands for sea towns that the people of Zebulun will inhabit or build. These cities will provide shelter for ships. (See: [[rc://en/ta/man/translate/figs-metonymy]])