Complex sentence: On 11 November 2014, Microsoft announced that Lync would be replaced by Skype for Business in 2015, which would combine features of Lync and the consumer Skype software.
Split into simpler sentences: On 11 November 2014, Microsoft announced that in 2015 Lync will be replaced by Skype for Business. The next version of the communication software will combine features of Lync and the consumer Skype software.