Simplify the following text for a Grade 9 native English-speaking person.
Original: William Morris `` Billy '' Hughes , CH , KC ( 25 September 1862 â `` 28 October 1952 ) , Australian politician , was the seventh Prime Minister of Australia from 1915 to 1923 .
Simplified: William Morris `` Billy '' Hughes ( 25 September 1862 â `` 28 October 1952 ) was the seventh Prime Minister of Australia .