Complex sentence: Many of these craniofacial traits are also common among Australoid populations, where they are regarded as plesiomorphic or archaic retentions that date back to the original dispersal of the "Homo" genus during the early Pleistocene.
Split into simpler sentences: Many of these craniofacial traits are also common among Australoid populations. However, these craniofacial traits themselves are ultimately believed to be plesiomorphic or archaic retentions that date back to the original dispersal of the "Homo" genus during the early Pleistocene.