Original sentence: These nouns are really neuter, and their endings derive regularly from the Latin neuter endings of the 2nd declension; the tradition of calling them "irregular" or "mobile gender" (genere mobile) comes from the fact that there are very so few nouns of this kind that the existence of neuter can be considered vestigial
Edited sentence: These nouns are more accurately neuter, and their endings derive regularly from the Latin neuter endings of the 2nd declension; the tradition of calling them "irregular" and ignoring the existence of a neuter gender comes from the fact that there are very few nouns of this kind