Add punctuation: So you need a precise tool to convert OST file to PST file without damaging it further
A: So you need a precise tool to convert OST file to PST file, without damaging it further.

Add punctuation: It was allout war The FLN announced that twelve thousand Muslims had been killed but this is an unlikely figure released only for propaganda purposes
A: It was all-out war. The FLN announced that twelve thousand Muslims had been killed, but this is an unlikely figure released only for propaganda purposes.

Add punctuation: Smooth it neatly cover with clingfilm and put the cake in the refrigerator an hour or two
A:
Smooth it neatly, cover with clingfilm and put the cake in the refrigerator an hour or two.