Complex sentence: The ATIV S is Samsung's first device to run Windows Phone 8, and with its unveiling at IFA 2012 in Berlin; it was also the first Windows Phone 8 device to be officially unveiled.
Split into simpler sentences: The ATIV S is Samsung's first Windows Phone 8 device. It was shown at the IFA 2012 in Berlin and was the first Windows Phone 8 device to be officially unveiled.