This canvas was cleaned, flattened and mounted onto a cradled board. The canvas has distortions over the surface as well as shrinkage, which widened the tears.
If a canvas has enough physical damage, a full lining of the canvas could be warranted over multiple patches. Over time, patches will inevitably show from the front of the canvas.
This brittle canvas needed conditioning before lining, filling and touchup.
Upper left: the original, torn canvas
Upper right: fitted with a new lining
Lower: the finished piece, restored to like-new condition