Simplify the following text for a Grade 9 native English-speaking person.
Original: Dr. Gill , who did the tests , decided that if `` you accept that these samples came from Anna Anderson , then Anna Anderson could related to Tsar Nicholas or Tsarina Alexandra . ''
Simplified: According to Dr. Gill who conducted the tests , `` If you accept that these samples came from Anna Anderson , then Anna Anderson could not be related to Tsar Nicholas or Tsarina Alexandra . ''