Complex sentence: One of the highest death tolls occurred at Wolstenholme Towne, the site of a recent archaeological dig which was downriver from Jamestown at Martin's Hundred, now part of Carter's Grove Plantation.
Split into simpler sentences: One of the highest death tolls occurred at Wolstenholme Towne downriver from Jamestown at Martin's Hundred. The site of a recent archaeological excavation, it is now within the boundaries of Carter's Grove Plantation.