Complex sentence: However, the producers also realize the concept of the parallel universe could be confusing to viewers and have introduced elements of the world in small pieces over the course of the first two seasons before the larger reveal in the second season finale and third season.
Split into simpler sentences: However, the producers also realized the concept of the parallel universe could be confusing to viewers. To avoid this, they introduced elements of the world in small pieces over the course of the first two seasons before the larger reveal in the second season finale and third season.