Complex sentence: Pinkner and Wyman brought back the "Cortexiphan kids", introduced in the first two seasons, because they felt the storyline was really interesting and wanted the end of the season to be a "beautiful culmination of everything" while traveling to the Other Side.
Split into simpler sentences: Pinkner and Wyman brought back the "Cortexiphan kids", introduced in the first two seasons, because they felt that part of the storyline was really interesting. They wanted the end of the season to be a "beautiful culmination of everything" while traveling to the Other Side.