Unfortunately there is no painting of Christoffer Tnder in the ancestor gallery from Dnnes but there is one of his son chief county admidministrative officer Peder Christoffersen Tnder

What is the correctly punctuated version of this sentence?
Unfortunately, there is no painting of Christoffer Tnder in the ancestor gallery from Dnnes, but there is one of his son, chief county admidministrative officer Peder Christoffersen Tnder.