[Grammar] he was expecting- countries would support

[oksuz_]

Hi,

I think, he was expecting that once he showed the proof, countries would support him by one by. But it turned out otherwise.

Is the above sentence grammatical?

 

[emsr2d2]

Hi,

I think (no comma here) he was expecting that, once he showed the proof, countries would support him by one by (no full stop here) but it turned out otherwise.

Is the above sentence grammatical?

See above. I don't know what the underlined part means.

 

[Roman55]

countries would support him by one by.

Maybe you meant, one by one.