This was at the begining of the age of the industrialisation, factory work was very harsh, workers had to live in a very small and crowded space, many weren't insured and didn't get enough money for working 12 or more hours a day.
It seems that you have missed the necessary options to complete this statement, but anyway, the correct answer that would best complete this statement is the word complicated. The term that best describes factory work during the 1800s is complicated. Hope this answers your question.
