Simplify the following text for a Grade 8 native English-speaking person.
Original: The earliest written record of Chinese past so far discovered dates from the Shang Dynasty in perhaps the 13th century BC and takes the form of inscriptions of divination records on the bones or shells of animalsâ '' the so-called oracle bones .
Simplified: From the time of the Shang Dynasty ( 13th century BC ) , some written history is available . Writings were done on Oracle Bones .