Complex sentence: The Akatsuki succeeds in capturing and extracting seven of the Tailed Beasts, killing all the hosts except Gaara (the host of the One-Tail) who is saved by Naruto and his comrades.
Split into simpler sentences: The Akatsuki succeeds in capturing and extracting seven of the creatures out of their hosts. The one victim who survived was Gaara, the host of the One-Tail, whose life was saved by Naruto and his comrades.