Grammar / style question ... is .... and is ...

[LaPeste]

I'm writing a report and an editor has gone through and made a change a few times. I've written a few sentences such as (the topic is changed, so I'm not asking advice to rewrite the sentence, as I know the example I write could be simplified).

Something (Inflation, recycling, etc) is an important issue, and is often undervalued.

The editor has changed it to …

Something (Inflation, recycling, etc) is an important issue, and often undervalued compared to something else.

The edited version doesn't sound correct. Would you use the structure ".... is …. and is"? Or do you prefer "... is … is"?

Just asking for opinions

I would say 'which is'

I think they're both correct but I would use the editors version.

I think the second "is" is unnecessary, so I prefer the editor's version.

I do editing professionally and sometimes it's down to personal preference rather than something being wrong.

Something (Inflation, recycling, etc) is an important issue, and often undervalued compared to something else.

I'd prefer to read .....Something is an important issue, which is very much undervalued in comparison to xyz.

If I was trying to get a point across in strongest terms.
The very can be left out, if it doesn't equate with the comparison being made.

I prefer the editor's version too, but yours was fine. It probably just comes down to house style or personal preference.

Your editor is correct. Omission of the verb to be is perfectly normal where it can be mentally supplied from its appearance in the preceding clause.

I knew private schools were good for something

Thanks. In my defence, the sentences that I am writing are slightly longer than the example I gave, with a few additional clauses. But still, I will stick with the editor's version