Complex sentence: The upper part of the valley of the Bannock Burn appears to have been inhabited in the Iron Age, and the OS map shows several Duns in the Graigend and Murrayshall area and a Fort on Lewis Hill.
Split into simpler sentences: The upper part of the valley of the Bannock Burn appears to have been inhabited in the Iron Age. Several duns are to be found in the Graigend and Murrayshall area and a fort on Lewis Hill.