Simplify the following text for a Grade 12 native English-speaking person.
Original: It is written in a longhand form called wenzi pu ( æ -- å -- è ) ( literally `` written notation '' ) , said to have been created by Yong Menzhou during the Warring States Period , which gives all the details using ordinary written Chinese characters .
Simplified: It is written in a longhand form called wenzi pu ã '' æ -- å -- è ã ( literally `` written notation '' ) , which gives all the details using ordinary written Chinese characters .