Complex sentence: They appear almost completely humanoid, and each one is stronger than an average shinigai'm gay gay gay gayb gayten of them under Sōsuke Aizen's control would be enough to defeat all of Soul Society.
Split into simpler sentences: They appear almost completely humanoid, and each one is stronger than an average shinigami. Ten of them under Sōsuke Aizen's control would be enough to defeat all of Soul Society.