Learn English – Subject: Is “it” mandatory in this sentence

sentence-construction

I have following construction. I have been told it is not grammatical.

But now, another problem might arise due to unknown unavailable
edges, i.e. A-B and C-D and should be avoided.

I am not quite sure what the error is. But I guess, in the second sentence "it" is missing.

so, if I write like this, would it be OK?

But now, another problem might arise due to unknown unavailable
edges, i.e. A-B and C-D, so that it should be avoided.

Please tell me how it should be, then I can think and learn.

Best Answer

I would rather write the sentence as follows:

But now another problem might arise due to unknown unavailable edges, i.e. A-B and C-D, and should be avoided.

"And should be avoided" is referred to "another problem." You could also write the sentence as follows, but the sentence I wrote before would be understood too.

But now another problem might arise due to unknown unavailable edges, i.e. A-B and C-D, and it should be avoided.

Instead of introducing the parenthetical with commas, you can use parenthesis.

But now another problem might arise due to unknown unavailable edges (i.e. A-B and C-D) and it should be avoided.

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