Complex sentence: Therefore, hot dog carts are often limited to reheating pre-cooked wieners using heat produced by propane or electricity and serving these on buns with certain approved condiments such as mustards, pickles, pickled relishes, chopped onions, and tomato ketchup.
Split into simpler sentences: Therefore, hot dog carts are often limited to reheating pre-cooked wieners using heat produced by propane or electricity. The wieners are served on buns with certain approved condiments such as: mustards, pickles, pickled relishes, chopped onions, and tomato ketchup.