Spoiler:

ワンダーワイスはじじいの能力封じるためだけにつくられてその引き換えに
Wonderwyce was only created to seal Yama's abilities, but
言葉も知識も記憶も理性も失った。
he lost his speech, knowledge, memory, and reasoning.
じじいのピンチかと思われたが右の拳で殴り飛ばす（一骨という技名ぽい）。ＷＷの腹に穴ができるほど。
Yama appeared to be in trouble, but he knocks him down with his right fist. (technique called 'one bone'). The punch is so hard that it creates a hole in WW's abdomen.
「流刃火を封じればワシを討てると思うてか」
"You thought you could defeat me by sealing Ryuujin Jakka?"
さらに自分が千年も総隊長を務めてるのは自分より強い死神が千年生まれてないからだという。
That he's been the Captain Commander for 1000 years means there isn't a shinigami stronger than him born in the last 1000 years.
愛染の懐に飛び込み拳を放つがＷＷが邪魔をする。
He aims a punch at Aizen's chest, but WW blocks it.
激しい戦闘が繰り広げられるが、ＷＷに両手をつかまれ、さらに両肩から生えた無数の手によって連続で殴打される。
An intense battle unfolds and WW grabs his two hands. A large number of objects resembling arms sprout out of WW's shoulders and beat on Yama continuously.
が、じじいには効いてない。「終いか？」とＷＷに尋ねたあと、ＷＷの両手を引きちぎる。
However, they are ineffective against Yama. "Are you finished?" he asks WW. He then rips off both of WW's hands/arms.
「せめても　童の姿でなくなってよかった。心後らず　打ち殺せる。」
"At least you aren't in the form of a child.　I can beat you to death without hesitation."
その言葉にＷＷがいつもどおりのうめき声をだすが、その声にはじじいに対する恐怖。
WW responds with his usual moaning, but it's with fear of Yama.
両の手の拳でＷＷの腹を衝いた（双骨という技）ところで次週へ
With both fists Yama pounds WW in the abdomen (technique called 'double bone').

Citation:
wonderweiss exchanged speech, knowledge, memory and reason for the ability to seal yama's RJ

-yama knocks away wonderweiss using his right hand and opens a hole in his stomach (the move is iterally called single bone)

-yama: "you think you can defeat me by sealing RJ? i've been the captain commander for 1000 years. it'll take another 1000 years before there's a shinigami as strong as i am"

-yama tries to fight aizen in close-quarter combat but was stopped by wonderweiss

-the battle is fierce, Yamamoto's hands are caught, and umpteen hands spawn from WWs shoulders hitting yama

-the attacks were completely useless

-yama: "is that all?"

-yama tears both hands off wonderweiss

-yama:"at least you don't look like a kid anymore. i can kill you without remorse"

-wonderweiss makes his usual nonsensical noise but his scream is filled with fear

-yama does his double fisted attack (double bone)