Complex sentence: A third season premiered on September 29,2015, concluding on May 17,2016, and the fourth season premiered on September 20,2016, and concluded on May 16,2017.
Split into simpler sentences: A third season premiered on September 29,2015, concluding on May 17,2016. The fourth season premiered on September 20,2016, and is scheduled to conclude on May 16,2017.