Heise has just used Jacob von Melle to prove that the first part of the painting until the canon had disappeared from Lbeck and now he has proved that the fragment in Tallinn used to end with the mayor

Please fix the punctuation.
Heise has just used Jacob von Melle to "prove" that the first part of the painting until the canon had disappeared from Lubeck, and now he has "proved" that the fragment in Tallinn used to end with the mayor.