Complex sentence: A bun can be secured with a barrette, bobby pins, a hair stick, a hairnet, and/or a pencil, and hair may be wrapped around a piece called a "rat".
Split into simpler sentences: A bun can be secured with a barrette, bobby pins, one or more hair sticks, a hairnet, or a pen or pencil. Hair may also be wrapped around a piece called a "rat".