Complex sentence: A major non-Aikikai branch is Iwama Shin Shin Aiki Shurenkai, headed by Saito's son Hitohiro Saito, and a now defunct Iwama style organisation was the Iwama Ryu.
Split into simpler sentences: A major non-Aikikai branch is Iwama Shin Shin Aiki Shurenkai, headed by Saito's son Hitohiro Saito. A now defunct Iwama style organisation was the Iwama Ryu.