Complex sentence: Gong farmers were only allowed to work at night, hence they were sometimes known as nightmen, and the waste they collected, known as night soil, had to be taken outside the city or town boundary or to official dumps for subsequent disposal.
Split into simpler sentences: Gong farmers were only allowed to work at night, hence they were sometimes known as nightmen. The waste they collected, known as night soil, had to be taken outside the city or town boundary or to official dumps for subsequent disposal.