Simplify the following text for a Grade 12 native English-speaking person.
Original: Alfred Russel Wallace , OM , FRS ( 8 January 1823 â `` 7 November 1913 ) was a British naturalist , explorer , geographer , anthropologist and biologist .
Simplified: Alfred Russel Wallace OM , FRS , ( 8 January 1823 â `` 7 November 1913 ) was a British naturalist , explorer , biologist and social activist .