Complex sentence: The record begins with the first European settlers in Nantucket, and extended beyond her death into 1912 through the work of her niece, and served as a basis for a contemporary geneology record through the Nantucket Historical Association's preservation and expansion of the archive.
Split into simpler sentences: The record begins with the first European settlers in Nantucket, and extended beyond her death into 1912 through the work of her niece. They serve as a basis for a contemporary geneological record through the Nantucket Historical Association's preservation and expansion of the archive.