Which is correct:

(a) The new team, who will bring organization skills, is welcomed.

(b) The new team, which will bring organizational skills, is welcomed.

ANSWER: I believe the correct way to say it is (b) The new team, WHICH will bring organizational skills, is welcome.

My reasoning is as follows:

The word "team" is simply a noun. Just as any other noun could be used in its place (The new computer, The new program, etc.)--- a simple and general singular noun is used with the word "which."

I agree WHICH is better. However, if you decided to use ARE welcome, then WHO might be better. Example:

The new team, who will bring organizational skills, are welcomed.

Remember, collective nouns can be singular or plural depending on context.