Simplify the following text for a Grade 8 native English-speaking person.
Original: David Lloyd George , 1st Earl Lloyd-George of Dwyfor OM , PC ( 17 January 1863 â `` 26 March 1945 ) was a British Liberal politician and statesman .
Simplified: David Lloyd George , 1st Earl Lloyd-George of Dwyfor OM , PC ( 17 January , 1863 â `` 26 March , 1945 ) was the British Prime Minister during the last half of World War I. He was Prime Minister for six years , between 1916 and 1922 .