Complex sentence: People not only local citizens but also the royal family used Gochujang as their indispensable food and source of nutrition.Gochujang's production process today is almost as same as the process ancient Koreans used.
Split into simpler sentences: People not only local citizens but also the royal family used Gochujang as their indispensable food and source of nutrition. Interestingly enough, Gochujang's production process today is almost as same as the process ancient Koreans used.