Original: The division of this work into two books was introduced by the translators of the Septuagint (the Greek translation of the Old Testament), and was subsequently followed in the Latin Vulgate and most modern translations.
Simplified: However, it was divided into two books by the translators of the Septuagint (the Greek translation of the Old Testament), and so it was written as 1 and 2 Kings by the Latin translation and many other versions.