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This DNA can reveal genetic information about only one or two ancestors, even though, for example, just three generations back people also have six other great-grandparents or, four generations back, 14 other great-great-grandparents. (2009 Text2)
难句分析
主句
This DNAcan revealgenetic informationabout only one or two ancestors,
主语 谓语 宾语后置定语
状语从句1
even though, for example, just three generations back people also havesix other great-grandparents
连词 插入语状语 主语 谓语 宾语
状语从句2
or,four generations back,(people also have)14 other great-great-grandparents.
并列连词 状语主语 谓语宾语
参考译文
这种DNA只能揭示一两位祖先的基因信息,虽然仅上溯三代人,每个人还有检测之外的六位曾祖,或者上溯四代,每个人还有十四位高祖(的信息被遗漏)。