The family of a Nazi official who stole a painting that belonged to a Jewish art dealer during World War II handed the artwork to the Argentine authorities on Wednesday, more than eight decades after it was taken. “The family’s lawyer brought it; he showed up at the prosecutor’s office and said he wanted to hand over the painting we were looking for, and nothing else,” said Carlos Martínez, the federal prosecutor in the coastal town of Mar del Plata. The painting, an early 18th-century work by the Italian artist Giuseppe Ghislandi, had not been seen from 1945 until last...