Complex sentence: Over the years Courtenay acquired considerable property, much of it by way of his marriages, and held some 14 manors at his death, principally in the West Country, but also in Essex and Herefordshire.
Split into simpler sentences: Over the years Courtenay acquired considerable property, much of it by way of his marriages. At his death he held 14 manors, principally in the West Country, but also in Essex and Herefordshire.