…ut [ [ in senātū [ nōn semel sed saepe multīs = que verbīs huius [ mihi salūtem imperī atque orbis terrārum adiūdicā]]]₁rit ].
that  in Senate.ABL  not once but often many.ABL = and words.ABL this.GEN  me.DAT safety.ACC empire.GEN and.also orb.GEN lands.GEN attribute-TH-PERF.SJV-3SG 
…that he credited me in the Senate, not once but often and at length, with having saved the empire and the world.