Simplify the following text for a Grade 8 native English-speaking person.
Original: At rallies near the Gutenberg Museum , which honored Johannes Gutenberg , the founder of the printing press , Kellner would hold above his head Adolf Hitlerâ s book , Mein Kampf , and yell out to the crowd : `` Gutenberg , your printing press has been violated by this evil book . ''
Simplified: Kellner would show his opposition at rallies by holding Adolf Hitlerâ s book , Mein Kampf , above his head . He then shouted to the crowd : â Gutenberg , your printing press has been violated by this evil book .