Complex sentence: A 2008 study concluded that a magnitude 6 or 7 earthquake was destined to originate from the Ramapo fault zone, which would almost definitely spawn hundreds or even thousands of fatalities and billions of dollars in damage.
Split into simpler sentences: A 2008 study concluded that a magnitude 6 or 7 earthquake was destined to originate from the zone. This would almost definitely spawn hundreds or even thousands of fatalities and billions of dollars in damage.