Complex sentence: Nomura is currently working on "Kingdom Hearts 3D" and other new untitled titles of the Kingdom Hearts series, In addition he is also working on "Kingdom Hearts III" which is currently in the conceptual stages.
Split into simpler sentences: Nomura is currently working on "Kingdom Hearts 3D" and other new untitled installments of the Kingdom Hearts series. He is also working on "Kingdom Hearts III," which is currently in the conceptual stages.