Complex sentence: Pepperoni is usually made from a mixture of pork and beef; halāl pepperoni is all beef; turkey is also commonly used as a substitute, but the use of poultry in pepperoni must be appropriately labeled in the United States.
Split into simpler sentences: Pepperoni is usually made from a mixture of pork and beef. Turkey is also commonly used as a substitute, but the use of poultry in pepperoni must be appropriately labeled in the United States.