Complex sentence: The Samsung Galaxy Note is an Android smartphone/tablet computer hybrid, introduced in October 2011 and noted for its 5.3-inch screen size--between that of conventional smartphones, and larger tablets--and its included stylus.
Split into simpler sentences: The Samsung Galaxy Note is an Android smartphone/tablet computer hybrid that was introduced in October 2011. It has attracted attention because of its 5.3-inch screen size--between that of conventional smartphones, and larger tablets--and because of its included stylus.