Complex sentence: The GCRZ is an incipient rift zone akin to the Red Sea Rift where continental crust associated with the North American Plate is being pulled apart by tectonic forces and being replaced by newly formed oceanic crust and seafloor spreading.
Split into simpler sentences: The GCRZ is an incipient rift zone akin to the Red Sea Rift. In the GCRZ continental crust associated with the North American Plate is being pulled apart by tectonic forces and being replaced by newly formed oceanic crust and seafloor spreading.