Original:  Their lands and resources are bounded on the east by the Mikmaq people, on the west by the Penobscot people , and on the south by the Passamaquoddy people , who also still speak related Algonquian languages.
Revised:  Their lands and resources are bounded on the east by the Mikmaq people, on the west by the Penobscot , and on the south by the Passamaquoddy people , who also still speak related Algonquian languages.
Edit intent: clarity