Complex sentence: In special relativity, the relativity of simultaneity implies there is not a unique present, and many of special relativity's counter-intuitive predictions such as length contraction and time dilation are a result of this.
Split into simpler sentences: In special relativity, the relativity of simultaneity implies there is not a unique present. Many of special relativity's counter-intuitive predictions such as length contraction and time dilation are a result of this.