Original: Not all manors contained all three kinds of land: typically, demesne accounted for roughly a third of the arable area, and villein holdings rather more; but some manors consisted solely of demesne, others solely of peasant holdings.
Simplified: Not all manors had all three kinds of land: as an average, demesne accounted for roughly a third of the arable area and villein holdings rather more; but some manors consisted solely of demesne, others solely of peasant holdings.