Complex sentence: Although previously, the 1881 census data showed that the "Agriculture" industry was by far the dominant trade, with over 50 males then involved in that area of work, the industry of the parish has almost certainly transformed into the present day.
Split into simpler sentences: Although previously, the 1881 census data showed that the "Agriculture" industry was by far the dominant trade. With over 50 males involved in that area of work in 1881, the industry of the parish has almost certainly transformed into the present day.