Complex sentence: Cranks or pins attached to the two shafts move the two ends of a whippletree linkage (sometimes referred to as a combining lever) sinusoidally; if the dimensions are chosen correctly, the midpoint of the rod moves in a way that simulates the equation of time.
Split into simpler sentences: Cranks or pins attached to the two shafts move the two ends of a rod sinusoidally. If the dimensions are chosen correctly, the midpoint of the rod moves in a way that simulates the equation of time.