Student or Learner
"X is a relatively young firm, which has been in the market since 2000."
I'm not sure, but I think the comma is correct because the "which" clause provides additional information; the central point is that the firm is young. Do you agree?
I would recast this sentence so that the relative clause is clearly non-restrictive:
"X is a relatively young firm that has been in the market since 2000."
Last edited by Raymott; 04-Jan-2011 at 02:31.