Complex sentence: Three versions have been shown, the first debuting at the 2005 North American International Auto Show (NAIAS), this concept was about five inches shorter than the Porsche 911 Turbo (996) with a wheelbase about nine inches longer.
Split into simpler sentences: Three versions have been show the first debuting at the 2005 North American International Auto Show (NAIAS). The first concept was about five inches shorter than the Porsche 911 Turbo (996) while its wheelbase was nine inches longer.