Simplify the following text for a Grade 4 native English-speaking person.
Original: Dr. Dr. Gustav Walter Heinemann ( born 23 July 1899 in Schwelm ; died 7 July 1976 in Essen ) was a German politician .
Simplified: Gustav Walter Heinemann , GCB ( b. July 23 , 1899 , in Schwelm - d. July 7 , 1976 , in Essen ) was a German politician .