Complex sentence: Their supporters ranged from centrists who supported a moderately capitalist liberal democracy to revolutionary anarchists; their base was primarily secular and urban, but also included landless peasants, and was particularly strong in industrial regions like Asturias and Catalonia.
Split into simpler sentences: Their supporters ranged from centrists who supported a moderately capitalist liberal democracy to revolutionary anarchists. Their base was primarily secular and urban, but also included landless peasants, and was particularly strong in industrial regions like Asturias and Catalonia.