Complex sentence: In 1926 he attempted an armed action against the Spanish dictatorship of Miguel Primo de Rivera from Prats de Molló (Roussillon), aborted by the French Gendarmerie, that gained a lot of popularity for his cause in Catalonia.
Split into simpler sentences: In 1926 he attempted an insurrection against the Spanish dictatorship of Miguel Primo de Rivera. Although it was aborted by the French Gendarmerie, it gained a lot of popularity for his cause in Catalonia.