Complex sentence: The market grew and as of 2008 there are a number of companies producing resin kits professionally, such as Federation Models, Volks, WAVE/Be-J, Kaiyodo, Kotobukiya, and B-Club, a subsidiary of Bandai producing Gundam kits.
Split into simpler sentences: The market grew and as of 2008 there are a number of companies producing resin kits professionally. Companies producing kits professionally include Federation Models, Volks, WAVE/Be-J, Kaiyodo, Kotobukiya, and B-Club, a subsidiary of Bandai producing Gundam kits.