Complex sentence: The iPhone 6 and iPhone 6 Plus are smartphones designed and marketed by Apple Inc. The devices are part of the iPhone series and were unveiled on September 9,2014, and released on September 19,2014.
Split into simpler sentences: The iPhone 6 smartphone and iPhone 6 Plus phablet, designed and marketed by Apple Inc., are part of the iPhone series. The models were unveiled on September 9,2014, and released on September 19,2014.