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
Re-establishing of the Tribunician Power
They now went to work in all earnest to set aside the Sullan institutions. First of all the tribunician magistracy regained its earlier authority. Pompeius himself as consul introduced the law which gave back to the tribunes of the people their time-honoured prerogatives, and in particular the initiative of legislation-- a singular gift indeed from the hand of a man who had done more than any one living to wrest from the community its ancient privileges.
New Arrangement as to Jurymen
With respect to the position of jurymen, the regulation of Sulla, that the roll of the senators was to serve as the list of jurymen, was no doubt abolished; but this by no means led to a simple restoration of the Gracchan equestrian courts. In future--so it was enacted by the new Aurelian law--the colleges of jurymen were to consist one-third of senators and two-thirds of men of equestrian census, and of the latter the half must have rilled the office of district-presidents, or so-called -tribuni aerarii-.
This last innovation was a farther concession made to the democrats, inasmuch as according to it at least a third part of the criminal jurymen were indirectly derived from the elections of the tribes. The reason, again, why the senate was not totally excluded from the courts is probably to be sought partly in the relations of Crassus to the senate, partly in the accession of the senatorial middle party to the coalition; with which is doubtless connected the circumstance that this law was brought in by the praetor Lucius Cotta, the brother of their lately deceased leader.
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Reference address : https://www.ellopos.net/elpenor/rome/5-03-fall-oligarchy-pompeius.asp?pg=13