Complex sentence: In 1669 colonists patented the land on the west of the Potomac as far north as My Lord's Island, and by 1670, they drove most of the Doeg completely out of Virginia, apart from those living beside the Nanzattico/Portobago in Caroline County.
Split into simpler sentences: In 1669 colonists patented the land on the west of the Potomac as far north as My Lord's Island. By 1670, they drove most of the Doeg out of the Virginia colony, apart from those living beside the Nanzattico/Portobago in Caroline County.