Simplify the following text for a Grade 9 native English-speaking person.
Original: My Opposition : the Diaries of Friedrich Kellner The railroad station of Hungen can be seen in this 2007 Canadian documentary , which recounts the story of Robert Scott Kellner and his grandfather , Friedrich Kellner , chief justice inspector of Laubach who wrote the anti-Nazi diary , `` My Opposition . ''
Simplified: My Opposition : the Diaries of Friedrich Kellner : The railroad station of Hungen can be seen in this 2007 Canadian documentary . Robert Scott Kellner came to Hungen in 1960 to search for his grandfather , Friedrich Kellner .