Complex sentence: Between the 1873 and 1881 the Society faced great difficulties due to a serious local economic depression; of the 600 and more factories engaged in the silk trade, fewer than 100 survived.
Split into simpler sentences: Between the 1873 and 1881 the Society faced great difficulties due to a serious local economic depression. Of the 600 and more factories engaged in the silk trade, fewer than 100 survived.