Complex sentence: On November 20,2015, creator of the show Alex Hirsch announced that the second season would be the show's last and that it was his decision to end the show, and not the network's.
Split into simpler sentences: On November 20,2015, creator of the show Alex Hirsch announced that the second season would be the show's last. However, he stated that it was his decision to end the show, and not the network's.