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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.
句子解析:
主句之后是由even though引导的让步状语从句,该从句包含由or连接的两个分句;在**分句中,three generations back做时间状语,people做主语,have做谓语,six other great-grandparents做宾语;在第二个分句中省略了与首分句相同的句子成分—主语和谓语(people have),仅剩下时间状语for generations back和宾语14 other great-great-grandparents。
参考译文:这种DNA检测只能显示出一两位祖先的基因信息,而仅上溯三代,每个人都有其他的6位曾祖父母,或者上溯四代,还有另外的14位高祖父母。