Complex sentence: Testing of a young woman's bones buried in O'ahu dated sometime between AD 1422 and 1664, according to radiocarbon dating that she had congenital syphilis; a disease which can leave a variety of distinctive marks on bone.
Split into simpler sentences: Testing of a young woman's bones buried in O'ahu dated sometime between AD 1422 and 1664, according to radiocarbon dating. She had congenital syphilis, a disease which can leave a variety of distinctive marks on bone.