Complex sentence: Mitochondrial Eve is the female counterpart of Y-chromosomal Adam, the patrilineal most recent common ancestor, both of these historically proven individuals having lived at the same time and were responsible for the procreation of every human being in history.
Split into simpler sentences: Mitochondrial Eve is the female counterpart of Y-chromosomal Adam, the patrilineal most recent common ancestor. Both of these historically proven individuals lived at the same time and were responsible for the procreation of every human being in history.