Complex sentence: Microsoft Office 2016 (codenamed Office 16) is an upcoming version of Microsoft Office that is rumored to be released for Microsoft Windows on 22 September 2015 and was released on OS X on 9 July 2015 for Office 365 subscribers.
Split into simpler sentences: Microsoft Office 2016 (codenamed Office 16) is an upcoming version of Microsoft Office. It was released on OS X on 9 July 2015 for Office 365 subscribers.