Complex sentence: Gallitzin censured Madame Swetchine, who was known to be a mystic, only for the fact that she lived abroad, due to Gallitzin's belief that true religion was to serve at home in Mother Russia.
Split into simpler sentences: Gallitzin censured Madame Swetchine, who was known to be a mystic, only for the fact that she lived abroad. Due to Gallitzin's belief that true religion was to serve at home in Mother Russia.