Simplify the following text for a Grade 9 native English-speaking person.
Original: John Scaddan , CMG ( 4 August 1876 â `` 21 November 1934 ) , popularly known as `` Happy Jack '' , was Premier of Western Australia from 7 October 1911 until 27 July 1916 .
Simplified: John Scaddan ( 4 August 1876 â `` 21 November 1934 ) was the 10th Premier of Western Australia from 7 October 1911 to 27 July 1916 .