Complex sentence: It deals 1.5x the damage of the opponent's attack to them while negating all damage done to Roy given that your opponent is within range of the sword, essentially giving Roy the ability to do extremely high amounts of damage.
Split into simpler sentences: It deals 1.5x the damage of the opponent's attack to them while negating all damage done to Roy given that your opponent is within range of the sword. Essentially giving Roy the ability to do extremely high amounts of damage.