Complex sentence: With this Thordarason commented that Rankin would never play for Barnsley again, and the player had his contract terminated with immediate effect, which allowed him to sign for Grimsby on a permanent basis until the end of the season.
Split into simpler sentences: With this Thordarason commented that Rankin would never play for Barnsley again, and the player had his contract terminated with immediate effect. Thus making him able to sign for Grimsby on a permanent basis until the end of the season.