Simplify the following text for a Grade 6 native English-speaking person.
Original: Parchment is a thin material made from calfskin , sheepskin or goatskin , often split . Its most common use was as a material for writing on , for documents , notes , or the pages of a book , codex or manuscript .
Simplified: The most common use for parchment was as a material for writing on , for the pages of a book .