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
Whether this was true or not, his successor Gaius Servilius (652) obtained no better results; and both generals were afterwards criminally impeached and condemned for their conduct in office--which, however, was not at all a certain proof of their guilt. Athenion, who after the death of Tryphon (652) was invested with the sole command, stood victorious at the head of a considerable army, when in 653 Manius Aquillius, who had during the previous year distinguished himself under Marius in the war with the Teutones, was as consul and governor entrusted with the conduct of the war. After two years of hard conflicts--Aquillius is said to have fought in person with Athenion, and to have killed him in single combat--the Roman general at length put down the desperate resistance, and vanquished the insurgents in their last retreats by famine.
The slaves on the island were prohibited from bearing arms and peace was again restored to it, or, in other words, its recent tormentors were relieved by those of former use and wont; in fact, the victor himself occupied a prominent place among the numerous and energetic robber-magistrates of this period. Any one who still required a proof of the internal quality of the government of the restored aristocracy might be referred to the origin and to the conduct of this second Sicilian slave-war, which, lasted for five years.
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Reference address : https://www.ellopos.net/elpenor/rome/4-04-rule-restoration.asp?pg=24