Complex sentence: For example, the rotation of the Earth can be observed from the rotating (with respect to inertial space) gravity vector acting on a Foucault pendulum to change its plane of vibration with respect to its surroundings.
Split into simpler sentences: For example, the rotation of the Earth can be observed using a Foucault pendulum. The rotation of the Earth causes the pendulum to change its plane of oscillation with respect to its surroundings.