Complex sentence: She was deposed along with all the democratic representatives by a military coup (the "Revolución Libertadora") on 16 September 1955, and was imprisoned by Pedro Eugenio Aramburu's military dictatotship.
Split into simpler sentences: She was deposed along with all the democratic representatives by the Coup on September 16th, 1955. And imprisoned by Pedro Eugenio Aramburu's military dictatotship.