Complex sentence: The failure of the military uprising (Revolt of Jaca) in Aragon of that same year sent him to prison, as a member of the revolutionary committee, but he left jail after the municipal elections of 12 April 1931.
Split into simpler sentences: The failure of the military uprising (Revolt of Jaca), in Aragon, of that same year took him to prison, as member of the revolutionary committee. But he left jail after the municipal elections of 12 April 1931.