Complex sentence: The list of contemporary ambassadors and historians unanimous in the belief that Columbus was Genoese could suffice as proof, but there is something more: a document dated 22 September 1470 in which the criminal judge convicts Domenico Colombo.
Split into simpler sentences: The list of contemporary ambassadors and historians unanimous in the belief that Columbus was Genoese could suffice as proof, but there is something more. One of them has been: the document dated 22 September 1470 in which the criminal judge convicts Domenico Colombo.