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Special A Grade Skilled Hunter. Former Head of Zeroth Special Unit. The hero who prevented the...
Explanation: First, I must say I'm not native English. I'm just giving an explanation which I hope will help you deciphering these sentences :)
Toku A kyuu means Special A Grade.
Sugo-ude can mean many things, like go-getter, hustler, crackerjack, good skill, being crackerjack or great ability.
Hantaa stands for Hunter.
I take it you got these lines from a video game or manga. There are many possible translations (you can make up as many names as you want), and though it might be possible that these terms already have been translated to English on official websites relating to this game/manga, I'll just stick to the literal translation now.
Toku A kyuu no sugo-ude hantaa = Special A Grade Skilled Hunter (you can change the word Skilled into any cool word you like with a similar meaning)
Moto = Former
Dai 0 = Zeroth
Tokushu = Special
Butai = Unit
Taicho = Head
Moto dai 0 tokushu butai taichou = Former Head of Zeroth Special Unit