Complex sentence: It can be reinvigorated by tumble drying the garment or ironing on a low settinthe garment with a wash-in re-proofer can again add water repellency to the face fabric.
Split into simpler sentences: It can be reinvigorated by tumble drying the garment or ironing on a low setting. If this does not work, re-proofing the garment with a wash-in re-proofer can again add water repellency to the face fabric.