Complex sentence: The aircraft that is flying across the Ocean for example, would be required to calculate ETPs for one engine inoperative, depressurization, and a normal ETP; all of which could actually be different points along the route.
Split into simpler sentences: The aircraft that is flying across the Ocean for example, would be required to calculate ETPs for single engine, depressurization, and a normal ETP. All of which could actually be different points along the route.