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Re: Roof deflection
I would suspect, because it looks to be more than just 'between trusses', that it was framing/trusses/rafters which were not installed in proper alignment.
I doubt there is a suitable repair which would not cause more damage than you would think.
I also doubt that there is a structural issue there.
HOWEVER, you *will* have water trying to run laterally across the shingles, and shingles are not designed nor intended for that, which means that is a roof leak waiting to happen.
How to address the 'roof leak' problem? About the only way would be to remove a sufficiently large area of shingles, install a couple of extra layers of felt, or that new peel and stick stuff then the felt underlayment, then lay new shingles in the area that was removed.
Of course, once the shingles have been removed and the underlayment removed, why not (at that time) shim the roof sheathing up flat and even, re-nail everything, then lay new shingles in that area.
Both are about the same amount of work, both will result in eliminating the leak, one will make it look 'right' and the other will only result in it being reported again when the buyer sells. Of course, the repair and shimming might result in that too, if not done 'properly', with permits, etc.
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