Complex sentence: In accordance with Newton's third law of motion, the mass exerts an equal and opposite force on the object directed from that object toward the rotating mass. This reaction force is the "reactive centrifugal force" referred to in this article.
Split into simpler sentences: In accordance with Newton's third law of motion, the mass exerts an equal and opposite force on the object. This reactive force is directed from that object toward the rotating mass. This reaction force is the "centrifugal reaction force" referred to in this article.