Simplify the following text for a Grade 7 native English-speaking person.
Original: The Jikji was written by the Buddhist monk Baegun ( 1298-1374 , Buddhist name Gyeonghan ) , who served as the chief priest of Anguk and Shingwang temples in Haeju , and was published in two volumes in Seongbulsan in 1372 .
Simplified: It was written by the Buddhist monk Baegun who died three years before this edition was printed . Baegun was the chief priest of the Anguk and Shingwang temples in Haeju .