Simplify the following text for a Grade 4 native English-speaking person.
Original: Frederick John Inman ( 28 June 1935 â `` 8 March 2007 ) was an English actor .
Simplified: Frederick John Inman ( 28 June 1935 â `` 8 March 2007 ) was an English actor best known for his role as Mr. Humphries in Are You Being Served ?