Simplify the following text for a Grade 9 native English-speaking person.
Original: The foundations of the Set and Nephthys temples at Sepermeru finally were discovered and identified in the 1980s , and the Nephthys temple was a self-sustaining temple complex within the Set enclosure .
Simplified: The foundations of the Set and Nephthys temples at Sepermeru finally were discovered and identified in the 1980s , and the Nephthys temple was no mere chapelâ '' rather , it was a notable , self-sustaining temple complex within the Set enclosure ( cf . ` Les Deesses de l'Egypte Pharaonique ' , R. LaChaud , 1992 , Durocher-Champollion ) . Likewise , there can be little doubt that a cult of Nephthys existed in the temple and great town of Herakleopolis , north of Sepermeru .