Simplify the following text for a Grade 10 native English-speaking person.
Original: Peter McCallum Dowding SC ( born 6 October 1943 in Melbourne ) was the 24th Premier of Western Australia , serving from 25 February 1988 until his resignation on 12 February 1990 after an internal party dispute .
Simplified: Peter M ` Callum Dowding ( born 6 October 1943 ) was the 24th Premier of Western Australia from 25 February 1988 to 12 February 1990 .