When both the deletions and additions are grouped in the same sentence, it can be hard to tell what the revised sentence is even supposed to be:
I think it would be better if it showed two sentences: the original one with only the deletions highlighted, and the revised one with only the additions highlighted. I think that’s how Lang-8 used to work, but I’m not too sure.
I know the current client will not be worked on any more, but I hope this can be considered for inclusion in the rewrite.