Complex sentence: The first part began its broadcast on September 11,2014 in its new date and time slot on Thursday nights at 8/7c, while the second part is slated to be broadcast in 2015.
Split into simpler sentences: The first part began its broadcast on September 11,2014 in its new date and time slot on Thursday nights at 8/7c. The second part is slated to be broadcast in 2015.