Simplify the following text for a Grade 7 native English-speaking person.
Original: David Russell Lange , ONZ , CH ( who pronounced his name ) ( 4 August 1942 â `` 13 August 2005 ) , served as the 32nd Prime Minister of New Zealand from 1984 to 1989 .
Simplified: David Lange ( August 4 1942 â '' August 13 2005 ) was the Prime Minister of New Zealand from 1984 to 1989 .