Simplify the following text for a Grade 8 native English-speaking person.
Original: Carol II of Romania ( 15 October\/16 October 1893 -- 4 April 1953 ) was the king of Romania from June 8 , 1930 until September 6 , 1940 .
Simplified: Carol II ( 15 October\/16 October 1893 -- 4 April 1953 ) reigned as King of Romania from 8 June 1930 until 6 September 1940 .