Complex sentence: The metals will affect the spin of the protons closest to the object; this is due to the metal entering the main magnetic field and having a current induced within the object; this current then causes a magnetic field to be created around the object itself.
Split into simpler sentences: The metals will affect the spin of the protons closest to the object. This is due to the metal entering the main magnetic field and having a current induced within the object; this current then causes a magnetic field to be created around the object itself.