Complex sentence: At the same time, prisoners usually do not make a good workforce, and the products produced by prison labor in China are of extremely low quality and have become unsalable on the open market in competition with products made by non-imprisoned paid labor.
Split into simpler sentences: At the same time, prisoners usually do not make a good workforce. The products manufactured by prison labor in China are of extremely low quality and have become unsalable on the open market in competition with products made by non-imprisoned paid labor.