Complex sentence: According to producers Ashley Edward Miller and Zack Stentz, "Fracture" was the third episode in the "gun arc", which involved Olivia gradually recovering from the wounds sustained in the premiere enough to be able to wield a gun and fight the shapeshifters.
Split into simpler sentences: According to producers Ashley Edward Miller and Zack Stentz, "Fracture" was the third episode in the "gun arc". The arc involved Olivia gradually recovering from her wounds sustained in the premiere enough to be able to wield a gun and fight the shapeshifters.