Complex sentence: Ganryu is the leader of a banished clan from the Soul Society, his clan was sent into the Valley of Screams, the same place where the lost souls known as Blanks reside, where they learned to survive the restricted current that swallows everything it touches.
Split into simpler sentences: Ganryu is the leader of a banished clan from the Soul Society. His clan was sent into the Valley of Screams (the same place where the lost souls known as Blanks reside) where they learned to survive the restricted current that swallows everything it touches.