Simplify the following text for a Grade 17 native English-speaking person.
Original: On 28 November 2010 , WikiLeaks and five major newspapers from Spain ( El PaÃ s ) , France ( Le Monde ) , Germany ( Der Spiegel ) , the United Kingdom ( The Guardian ) , and the United States ( The New York Times ) started to simultaneously publish the first 220 of 251,287 leaked confidentialâ '' but not top secretâ '' diplomatic cables from 274 US embassies around the world , dated from 28 December 1966 to 28 February 2010 .
Simplified: On 28 November WikiLeaks and five major newspapers - from Spain ( El PaÃ s ) , France ( Le Monde ) , Germany ( Der Spiegel ) , the United Kingdom ( The Guardian ) , and the United States ( The New York Times ) - all began to publish the first 291 of 251,287 confidential diplomatic cables from 274 embassies dated from 1966 â `` 2010 .