Simplify the following text for a Grade 11 native English-speaking person.
Original: Augusto JosÃ RamÃ n Pinochet Ugarte ( 25 November 1915 â `` 10 December 2006 ) was a Chilean army general and dictator who assumed power in a coup d' Ã tat on 11 September 1973 .
Simplified: General Augusto JosÃ RamÃ n Pinochet Ugarte ( November 25 , 1915 â `` December 10 , 2006 ) was a Chilean army general and president who led Chile from 1973 to 1990 .