Complex sentence: A locksmith who can break any lock with his fingers, Ginjiro (銀次郎 "Ginjirō") is also Captain of the Men in Black, code-named "Captain Bellybutton", but prefers not to be called that.
Split into simpler sentences: A locksmith who can break any lock with his fingers. He is also Captain of the Men in Black, code-named "Captain Bellybutton", but prefers not to be called that.