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
Cinna - Carbo - Sertorius
The name of the man whom the discontented had summoned to the head of the state, Lucius Cornelius Cinna, had been hitherto scarcely heard of, except so far as he had borne himself well as an officer in the Social war. We have less information regarding the personality and the original designs of Cinna than regarding those of any other party leader in the Roman revolution. The reason is, to all appearance, simply that this man, altogether vulgar and guided by the lowest selfishness, had from the first no ulterior political plans whatever.
It was asserted at his very first appearance that he had sold himself for a round sum of money to the new burgesses and the coterie of Marius, and the charge looks very credible; but even were it false, it remains nevertheless significant that a suspicion of the sort, such as was never expressed against Saturninus and Sulpicius, attached to Cinna. In fact the movement, at the head of which he put himself, has altogether the appearance of worthlessness both as to motives and as to aims.
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Reference address : https://www.ellopos.net/elpenor/rome/4-09-cinna-sulla.asp?pg=3