Complex sentence: The Fennomans in particular aimed to include the common people in a nonpolitical role in order to reduce unrest due to social problems; peasants and clergy had taken up the cause of the working man and woman already before the beginning of large-scale industrialization.
Split into simpler sentences: The Fennomans in particular aimed to include the common people in a non-political role in order to reduce unrest due to social problems. In fact, the peasants and clergy had already taken up the cause of the working man and woman before the beginning of large-scale industrialization.