Complex sentence: The word "orogeny" comes from the Greek (ὄρος "oros" for "mountain" and γένεσις "genesis" for "creation" or "origin"), and it is the primary mechanism by which mountains are built on continents.
Split into simpler sentences: The word "orogeny" comes from the Greek (ὄρος "oros" for "mountain" and γένεσις "genesis" for "creation" or "origin"),. Orogeny is the primary mechanism by which mountains are built on continents.