Simplify the following text for a Grade 9 native English-speaking person.
Original: The scale was published in 1974 by Graham Teasdale and Bryan J. Jennett , professors of neurosurgery at the University of Glasgow 's Institute of Neurological Sciences at the city 's Southern General Hospital .
Simplified: It was invented in 1974 by Graham Teasdale and Bryan J. Jennett , professors of neurosurgery at the University of Glasgow .