Complex sentence: The third generation MacBook Pro received overwhelmingly positive reviews because of the Retina display, flash storage, and power, however was criticized because of the price and lack of an ethernet port and optical drive.
Split into simpler sentences: The third generation MacBook Pro received overwhelmingly positive reviews because of the Retina display, flash storage, and power. It was criticized, however, because of the price and lack of an ethernet port and optical drive.