Complex sentence: This is a misreading of the statement "武士道と云ふは死ぬ事と見つけたり (The way of the samurai is found in death)", which was intended to mean that a samurai must always think of his death in order to to do things well.
Split into simpler sentences: This is a misreading of the following statement, "武士道と云ふは死ぬ事と見つけたり (The way of the samurai is found in death)". Actually, it tells that a samurai must always think of the death of himself to do things well.