anno ab urbe condita:
Cicero and Gaius Antonius Hybrida, the uncle of Mark Antony, held the consulship in 63BC.
AblAbs
ad delendam patriam:
Translate as "to destroy the fatherland." Ad and the gerundive delendam are used to express purpose.
GerPurp
Having twice failed to be elected consul, Catiline planned an uprising in Rome to seize power.
Cicero, however, caught wind of this and thwarted this plan.
cum quibusdam claris:
The addition of -dam makes it "with those certain people."
Claris in this sense means "distinguished" or "well-known."