Simplify the following text for a Grade 11 native English-speaking person.
Original: Charles the Fat ( 13 June 839 â `` 13 January 888 ) was the King of Alemannia from 876 , King of Italy from 879 , Holy Roman Emperor ( as Charles III ) from 881 , King of East Francia from 882 , and King of West Francia from 884 .
Simplified: Charles the Fat ( ; 13 June 839 â `` 13 January 888 ) was the King of Alemannia from 876 , King of Italy from 879 , western Emperor ( as Charles III ) from 881 , King of East Francia from 882 , and King of West Francia from 884 .