Complex sentence: Kindle Fire HD, later renamed to Fire HD, of Amazon's Kindle Fire line of touchscreen tablet computers was announced on September 6,2012 and was available in two models, 7 "and 8.9".
Split into simpler sentences: Kindle Fire HD, later renamed to Fire HD, are members of the Amazon Kindle Fire family of touchscreen tablet computers. The first model was announced on September 6,2012 and was available in two models, 7 "and 8.9".