Complex sentence: In a response to Catalan demands, limited autonomy was granted to Catalonia in 1913--abolished in 1920--and granted again in 1932 during the Second Spanish Republic, when the Generalitat, Catalonia's mediaeval institution of government, was restored.
Split into simpler sentences: In a response to Catalan demands, limited autonomy was granted to Catalonia in 1913, only to be abolished in 1920. It was granted again in 1932 during the Second Spanish Republic, when the Generalitat, Catalonia's mediaeval institution of government, was restored.