Complex sentence: It has been theorized by the espers that the current universe may be just one in a string that Haruhi has subconsciously created, as; despite having these powers, Haruhi is completely oblivious to them or the existence of aliens, time travelers, and espers.
Split into simpler sentences: It has been theorized by the espers that the current universe may be just one in a string that Haruhi had subconsciously created. Despite having these powers Haruhi is completely oblivious to them or the existence of aliens, time travelers, and espers.