Complex sentence: Evidence for the Early Mesolithic period in Cumbria is largely confined to finds in caves; for the Late Mesolithic, evidence comes from pits at Monk Moors and burning of heathland in the Eden Valley floodplain.
Split into simpler sentences: Evidence for the Early Mesolithic period in Cumbria is largely confined to finds in caves. For the Late Mesolithic, evidence comes from pits at Monk Moors and burning of heathland in the Eden Valley floodplain.