Simplify the following text for a Grade 8 native English-speaking person.
Original: The term `` IQ '' comes from German `` Intelligenz-Quotient '' , coined by the German psychologist William Stern in 1912 , who proposed a method of scoring children 's intelligence tests .
Simplified: The term `` IQ '' comes from the German word Intelligenz-Quotient . It was coined by the German psychologist William Stern in 1912 as a proposed method of scoring .