The phrase that got me thinking was; “…there are many correct answers to these questions”. I found your take on the “what/why/how” quite insightful. After reading the paragraph again i discovered it was talking about a very specify type of clock, the weight-driven mechanical clock, which in turn gave birth to the pendulum clock as we know it today. Here is my take;

What: The origin of the pendulum clock

Why: To understand the key inventions that were instrumental to the pendulum clock’s beginning

How: The transition from a key invention, escapement, to another, coiled spring or fusee

What do you think?