Complex sentence: In 1953 he joined Fidel and his brother Raúl Castro in the assault on the Moncada Barracks in Santiago, and was arrested and imprisoned with the Castro brothers in the Isle of Pines Prison.
Split into simpler sentences: In 1953 he joined Fidel and his brother Raúl Castro in the assault on the Moncada Barracks in Santiago. He was arrested and imprisoned with the Castro brothers in the Isle of Pines Prison.