Complex sentence: The third segment, "Night of the Dolphin" was written by Carolyn Omine based on an idea from the writers for an episode in a tribute to an animal and was settled on dolphins, because they are "the friendliest animal in the world".
Split into simpler sentences: The third segment, "Night of the Dolphin" was written by Carolyn Omine. The writers wanted to have a segment in a tribute to an animal and settled on dolphins, because they are "the friendliest animal in the world".