Complex sentence: On October 13,2015, it was announced that the upcoming fourth season of "Beauty & the Beast" would be its last; its final season premiered on June 2,2016, with its final episode airing on September 15,2016.
Split into simpler sentences: On October 13,2015, it was announced that the upcoming fourth season of "Beauty & the Beast" would be its last. Tjhe final season premiered on June 2,2016, before concluding on September 15,2016.