Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
In this manner provision was made for the preponderance of the freeholders in the comitia of the tribes, while for the centuriate comitia in themselves the wealthy already turned the scale.
By this wise and moderate arrangement on the part of a man who for his warlike feats and still more for this peaceful achievement justly received the surname of the Great (-Maximus-), on the one hand the duty of bearing arms was extended, as was fitting, also to the non-freehold burgesses; on the other hand care was taken that their influence, especially that of those who had once been slaves and who were for the most part without property in land, should be subjected to that check which is unfortunately, in a state allowing slavery, an indispensable necessity.
A peculiar moral jurisdiction, moreover, which gradually came to be associated with the census and the making up of the burgess-roll, excluded from the burgess-body all individuals notoriously unworthy, and guarded the full moral and political purity of citizenship.
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Reference address : https://www.ellopos.net/elpenor/rome/2-03-equalization-orders-aristocracy.asp?pg=41