Create a plane.
Several knife cuts (press K, select “exact cut”, draw cut across plane, press return)
Select the verticies that arn’t on the edge of the plane, press “smooth” in the edit buttons.
Select all, Extrude (press E, select all faces)
select all the origonal vertexes, and all the edge vertexes, then select [space] - select - invert
Rotate and scale a little so that the crracks are not in exaclty the same positions on both sides of the window.
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