Complex sentence: There are limits as to how high or how low an item will tweak, however every object is unique in its own way and is subject to a possible'freak tweak' meaning stats can potentially roll very high or extremely low.
Split into simpler sentences: There are limits as to how high or how low an item will tweak, however, every object is unique in its own way and is subject to a possible'freak tweak.' In this, stats can potentially roll very high or extremely low.