sentence2_structure: An object<>attached<>$$$a spring<>sliding<>on a frictionless surface$$$An object attached to a spring<>is<>an uncomplicated type of simple harmonic oscillator
sentence1: Very simple, uncomplicated type of game.
sentence2: An object attached to a spring sliding on a frictionless surface is an uncomplicated type of simple harmonic oscillator.
question: An object attached to a spring sliding on a frictionless surface is an uncomplicated type of what device?