Complex sentence: This first way is to refer to a style of menu in which each items is priced and ordered separately, as opposed to a fixed price menu where the customer doesn't select what they will eat but is served a preset multi-course meal at a set price.
Split into simpler sentences: This first way is to refer to a style of menu in which each items is priced and ordered separately. This is opposed to a fixed price menu in which, the customer does not select what he are she will order but is served a preset multi-course meal at a set price.