Complex sentence: But for some 16 intervening centuries of ongoing anatomical study, CSF remains unmentioned in the literature, perhaps because of the prevailing autopsy technique, which involved cutting off the head, thereby removing evidence of the CSF before the brain was examined.
Split into simpler sentences: But for some 16 intervening centuries of ongoing anatomical study, CSF remains unmentioned in the literature. This is perhaps because of the prevailing autopsy technique, which involved cutting off the head, thereby removing evidence of the CSF before the brain was examined.