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 genuineness of this document was no doubt disputed; but the senate acknowledged it by assuming in virtue of it the sums deposited in Tyre on account of the deceased king. Nevertheless it allowed two notoriously illegitimate sons of king Lathyrus, Ptolemaeus XI, who was styled the new Dionysos or the Flute-blower (Auletes), and Ptolemaeus the Cyprian, to take practical possession of Egypt and Cyprus respectively. They were not indeed expressly recognized by the senate, but no distinct summons to surrender their kingdoms was addressed to them.
The reason why the senate allowed this state of uncertainty to continue, and did not commit itself to a definite renunciation of Egypt and Cyprus, was undoubtedly the considerable rent which these kings, ruling as it were on sufferance, regularly paid for the continuance of the uncertainty to the heads of the Roman coteries. But the motive for waiving that attractive acquisition altogether was different. Egypt, by its peculiar position and its financial organization, placed in the hands of any governor commanding it a pecuniary and naval power and generally an independent authority, which were absolutely incompatible with the suspicious and feeble government of the oligarchy: in this point of view it was judicious to forgo the direct possession of the country of the Nile.
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Reference address : https://www.ellopos.net/elpenor/rome/5-02-rule-sullan-restoration.asp?pg=21