Simplify the following text for a Grade 6 native English-speaking person.
Original: The grave had been found nearly a decade earlier , but was kept hidden by its discoverers from the Communists who still ruled Russia when the grave was originally found .
Simplified: It had actually been found almost ten years earlier , but had been kept hidden by the people who discovered it . They did not want the Communists , who still ruled Russia at that time , to know where the grave was .