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
What had once appeared a daring dream, was now attained; the senate had ceased to govern. But when the few old men who had seen the first storms of revolution and heard the words of the Gracchi, compared that time with the present they found that everything had in the interval changed--countrymen and citizens, state-law and military discipline, life and manners; and well might those painfully smile, who compared the ideals of the Gracchan period with their realization. Such reflections however belonged to the past. For the present and perhaps also for the future the fall of the aristocracy was an accomplished fact. The oligarchs resembled an army utterly broken up, whose scattered bands might serve to reinforce another body of troops, but could no longer themselves keep the field or risk a combat on their own account.
But as the old struggle came to an end, a new one was simultaneously beginning--the struggle between the two powers hitherto leagued for the overthrow of the aristocratic constitution, the civil- democratic opposition and the military power daily aspiring to greater ascendency. The exceptional position of Pompeius even under the Gabinian, and much more under the Manilian, law was incompatible with a republican organization. He had been as even then his opponents urged with good reason, appointed by the Gabinian law not as admiral, but as regent of the empire; not unjustly was he designated by a Greek familiar with eastern affairs "king of kings."
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Reference address : https://www.ellopos.net/elpenor/rome/5-03-fall-oligarchy-pompeius.asp?pg=39