Why is it everyone seems to think jobs like this 'Seem smple.
It's that simple if you try jacking up the bent rafter with an acrow jack you could make things worse and lift the roof. Plus it's so simple the last owner didn't do it. I suspect he could see how difficult it can be.
Can't say how you'd do it except to add 6 x 2 inch joists along side the what seems to be 3INCH OR 4 x2inch joists .
A suggestion is to Cut the ends at the top of each end of the 6x2's to fit into the roof angle. DON'T notch the bottom instad to fit over the wall plate or you'll be back to square one. You will obviously have to remove tiles at eaves and cut the battens to get the new rafters in. Bolt each end to the roof rafter or secure with cut nails into the wall plate at an angle when the boarding is screwed down to the new joists it will tie everything together.
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