The district was founded in NUMBER@1 -LRB- under the name Arnstadt -RRB- ; it was divided in NUMBER@2 into the districts of LOCATION@1 and LOCATION@2 , but reunited in NUMBER@3 .

The district was founded in NUMBER@1 -LRB- under the name Arnstadt -RRB- ; it was divided in NUMBER@2 into the districts of LOCATION@1 and LOCATION@2 , but joined together again in NUMBER@3 .
