Original sentence: Both the Columbia Encyclopedia and Encarta Encyclopedia list the number as "from 35,000 to more than 135,000 dead.They are from disputed and unreliable sources, such as the Reich Ministry of Public Enlightenment and Propaganda headed by Joseph Goebbels, Soviet historians, and David Irving, a controversial and widely disputed historian, who has since retracted his higher estimates
Edited sentence: Both the Columbia Encyclopedia and Encarta Encyclopedia list the number as "from 35,000 to more than 135,000 dead", the higher figure of which is in line with Irving's published figures from his own so-called 'research'.They are from disputed and unreliable sources, such as the Reich Ministry of Public Enlightenment and Propaganda headed by Joseph Goebbels, Soviet historians, and David Irving, a controversial and now discredited self-taught historian who is a holocaust denier, and who has retracted his higher estimates