is this sentence correct?

I think it is not grammatical.
This is OK: " It is important that we win and also give an opportunity to the new comers."
However, I am not convinced with using these ideas together.

Sorry that is not the idea I wanted to convey
I meant wining is important so we dont want to give a chance to new comers

Kanka7It is important to winning the game rather giving the opportunity to new comers

Then, you can say this:
The important thing is winning the game and not giving opportunity to the new comers.

It is important we focus on winning the game rather than giving opportunity to the new comers.

Thanks suresh

You can also say "It is important to win rather than [to] give an opportunity to newcomers."

That is grammatica. I'm not sure that I would understand what you meant by "give an opportunity to newcomers" without your comment above.