Complex sentence: Lutz and others refer to the role of catholic publishers in proposing indianic stories by May around 1880 and further and others as mean of defending the separate and sort of tribal approach of German catholics in the previous Kulturkampf with secular protestant authorities.
Split into simpler sentences: Lutz and others refer to the role of catholic publishers in proposing indianic stories by May around 1880. Its being seen as means of defending the separate and as well, "sort of tribal" approach of German catholics as in the previous Kulturkampf with secular protestant authorities.