Complex sentence: Unfortunately, there had been a change of president in Uruguay and the new man, Anastasio de la Cruz Aguirre, who was on the fanatical wing of the Blancos, did not return tact with tact, but with counter-recriminations.
Split into simpler sentences: Unfortunately, there had been a change of president in Uruguay and the new man, Anastasio de la Cruz Aguirre, was on the fanatical wing of the Blancos. He did not return tact with tact, but with counter-recriminations.