Complex sentence: Historically, street food mainly included foods such as Eomuk, Bungeo-ppang, Tteok-bokki, etc. Many kinds of street food were developed for sale in a flat form, for example, peddler, cart bar, street vendor, and food truck.
Split into simpler sentences: Historically, street food mainly included foods such as Eomuk, Bungeo-ppang and Tteok-bokki. Street food has been sold through many types of retail outlets, with new ones being developed over time, for example, peddler, cart bar, street vendor, and food truck.