Complex sentence: Historically Rochford industries have been firmly based within the agriculture sector employing over 33.5% of the population in 1881 to the 2011 census there is currently nobody employed within the agricultural sector.
Split into simpler sentences: Historically Rochford industries have been firmly based within the agriculture sector employing over 33.5% of the population in 1881. According to the 2011 census there is currently nobody employed within the agricultural sector.