Complex sentence: Green Apple Books & Music has since expanded around its original space to include a second floor, a mezzanine, and in 1996 expanded into two store fronts to create their annex bringing the store from its original size of 750 square feet to 7,500 square feet.
Split into simpler sentences: Green Apple Books & Music has since expanded around its original space to include a second floor and a mezzanine. The Green Apple Annex, brought Green Apple Books & Music from its original size of 750 square feet to 7,500 square feet.