sentences:  From the 15th century to the 18th century, the villages of Alt Schlagsdorf, Buchholz, Flessenow, Neu Schlagsdorf, Retgendorf and Rubow belonged to the von Sperling family.Up until World War II, the area was part of the Grand Duchy of Mecklenburg-Schwerin.After 1945, it passed to the state of Mecklenburg, then to the GDR region of Schwerin.