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
The principal object of the party, however, was to revive the action of the allotment- commission which had been practically suspended; the leaders seriously talked of removing the obstacles which the Italian allies interposed to the scheme by conferring on them the rights of citizenship, and the agitation assumed mainly that direction. In order to meet it, the senate in 628 got the tribune of the people Marcus Junius Pennus to propose the dismissal of all non-burgesses from the capital, and in spite of the resistance of the democrats, particularly of Gaius Gracchus, and of the ferment occasioned by this odious measure in the Latin communities, the proposal was carried.
Marcus Fulvius Flaccus retorted in the following year (629) as consul with the proposal to facilitate the acquisition of burgess-rights by the burgesses of the allied communities, and to concede even to those who had not acquired them an appeal to the Roman comitia against penal judgments. But he stood almost alone--Carbo had meanwhile changed his colours and was now a zealous aristocrat, Gaius Gracchus was absent as quaestor in Sardinia--and the project was frustrated by the resistance not of the senate merely, but also of the burgesses, who were but little inclined to extend their privileges to still wider circles.
Flaccus left Rome to undertake the supreme command against the Celts; by his Transalpine conquests he prepared the way for the great schemes of the democracy, while he at the same time withdrew out of the difficulty of having to bear arms against the allies instigated by himself.
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Reference address : https://www.ellopos.net/elpenor/rome/4-03-revolution-gaius-gracchus.asp?pg=11