Complex sentence: Welwyn Garden City's current kit suppliers are Dita Field Hockey and they are currently without a shirt sponsor this season, they were sponsored by agency Key People before the 2009--2010 season.
Split into simpler sentences: Welwyn Garden City's current kit suppliers are Dita Field Hockey. And they are currently without a shirt sponsor this season, they were sponsored by agency Key People before the 2009-2010 season.