Complex sentence: Mary Beth Norton describes that many of the afflicted girls were orphaned maidservants from the Maine frontier, who had lived through the attacks and had many family members killed by the Wabanaki.
Split into simpler sentences: Mary Beth Norton points out that many of the afflicted girls were orphaned maidservants from the Maine frontier. These maidservants had lived through the attacks and were kin to many of those killed by the Wabanaki.