Simplify the following text for a Grade 14 native English-speaking person.
Original: The term `` Protestant '' was not originally used by Reformation era leaders ; instead , they called themselves `` evangelical '' , emphasising the `` return to the true gospel ( Greek : euangelion ) . ''
Simplified: The term `` Protestant '' , however , was not originally used by these leaders ; instead , they called themselves `` evangelical '' , emphasizing the `` return to the true gospel ( Greek : euangelion ) '' .