nihil egit aliud, had no other aim.
haec, the present condition of things, i.e. T. Ligarius could not have any interested motive in doing this favor, since he could not foresee how powerful Caesar was to become.
eum: ยง 300, b (196, a, 2, N.); G. 521, N.3; H. 449, II.
officio, service (to you).
tot talibus, many and excellent as they are.
condonaveris: condonare is to grant something for the sake of some one else.