Complex sentence: Marx described labor power asa worker's capacity to produce goods and services and explained that the long-run wage workers receive will depend on the number of labor hours it takes to produce a person who is fit for work.
Split into simpler sentences: Marx described labor power asa worker's capacity to produce goods and services. He explained that the long-run wage workers receive will depend on the number of labor hours it takes to produce a person who is fit for work.