Simplify the following text for a Grade 6 native English-speaking person.
Original: Odes is a book of the Bible found only in Eastern Orthodox Bibles and included or appended after Psalms in Alfred Rahlfs ' critical edition of the Septuagint , coming from the fifth-century Codex Alexandrinus .
Simplified: Odes is a book of the Bible that is only found in Eastern Orthodox Bibles .