Complex sentence: His memories of the event were subsequently sealed away as a result of the pass, or magical connection, between himself and the infant Dragon and the barrier that first generation Astral members Judaix, Hazel, Sekiren, Kashiwara and Nekoyashiki erected to seal the Dragon away.
Split into simpler sentences: His memories of the event were subsequently sealed away as a result of the pass, or magical connection, between himself and the infant Dragon. There is a barrier that first-generation Astral members Judaix, Hazel, Sekiren, Kashiwara and Nekoyashiki erected to seal the Dragon away.