Complex sentence: Since that time, Tucson Roller Derby has more than doubled in size, adding the Iron Curtain as a regular-season team in 2004, the Vice Squad in 2005, and the Copper Queens in 2007.
Split into simpler sentences: Since that time, Tucson Roller Derby has more than doubled in size, adding multiple home teams over the years. The Iron Curtain was added in 2004, the Vice Squad in 2005, and the Copper Queens in 2007.