Complex sentence: The downfall of the tobacco industry was caused by the rise of cigar consumption, of which the tobacco from Amerongen was unsuitable, the foreign tobacco market also contributed to the downfall of the local tobacco industry.
Split into simpler sentences: The downfall of the tobacco industry was caused by the rise of cigar consumption, of which the tobacco from Amerongen was unsuitable. The foreign tobacco market also contributed to the downfall of the local tobacco industry.