there's a mistake in this sentence and I can't figure it out
He's known to come if he hadn't been, he wouldn't have to complain
Thanks in advance

Question

there's a mistake in this sentence and I can't figure it out
He's known to come if he hadn't been, he wouldn't have to complain 
Thanks in advance

Answer

school test Yes and I know it makes no sense 
I thought it could be:  He's known to come. If he "weren't " he wouldn't have to complain. But I'm not sure

Answer

Apart from the sentence making no sense (yes I realise it's from a GSC exam), I wonder how a third conditional can be in the same sentence as present tense.

I actually suspect there's just one word which is wrong, and fixing that would make the sentence readable.

Answer

Not sure what you mean by that sentence