Complex sentence: Initially Waspinator, was to die at the beginning of season two but because people enjoyed Waspinator as comic relief, the creators decided to kill off Terrorsaur instead.
Split into simpler sentences: Initially Waspinator, not Terrorsaur, was to die at the beginning of season two. Because people enjoyed Waspinator as comic relief for the series, the creators decided to kill off Terrorsaur instead.