Complex sentence: The price of a piece of meat, for example, a steak, is typically advertised in dollars per pound, but the price printed on the package is in dollars per kilogram, and this is how amount the purchaser actually pays is calculated.
Split into simpler sentences: The price of a piece of meat, for example, a steak, is typically advertised in dollars per pound. However the price printed on the package will be in dollars per kilogram, and this is how amount the purchaser actually pays is calculated.