Add punctuation: A few days after Leibniz presented his dissertation his mother died
A: A few days after Leibniz presented his dissertation, his mother died.

Add punctuation: Cryoturbation Perturbation by daily and periodic freezing and thawing gradually moves soil particles stones and blocks sorting them into different patterns circles boils medallions and on slopes stripes and flows
A: Cryoturbation. Perturbation by daily and periodic freezing and thawing gradually moves soil particles, stones and blocks, sorting them into different patterns; circles, boils, medallions and on slopes stripes and flows.

Add punctuation: If the sequences ended then the sum could defined in terms of starting with the rightmost digits and expressing the sum in terms of the carry operation
A:
If the sequences ended then the sum could defined in terms of starting with the right-most digits and expressing the sum in terms of the carry operation.