。
She hung the laundry on the line.
Literal
She [topic-は] laundry [object-を] line [on-に] hung.
洗濯物 (せんたくもの) means 'laundry' — literally 洗濯 (washing) + 物 (things). The ~物 (もの) suffix is productive for creating 'things to be done/used': 買い物 (shopping/purchases), 食べ物 (food), 飲み物 (drinks). 紐 (ひも) means 'string, cord, or clothesline,' and かける here means 'to hang' or 'to drape' — one of many meanings this versatile verb carries.