I always have this fear behind my back that if I will try to edit out a portion of the comment (Like a whole sentence).

Will it affect my rankings?

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IMc Premium
Google won't care. Site owners often enhance site comments to add a long tail keyword or two or improve grammar etc.

The people who might care are your visitors who left the comments. They probably aren't expecting you to edit them too much.

So it depends on how you feel about upsetting them.
ClarkTan Premium
It's those comments, that has been given here in WA. So I doubt they will have a fit on that.

Thank you so much for responding! :D