Simplify the following text for a Grade 9 native English-speaking person.
Original: The district in its present form was established on July 1 , 1972 by merging the former districts of Melle , BersenbrÃ 1\/4 ck and Wittlage , and most of the old district of OsnabrÃ 1\/4 ck .
Simplified: The district was established in 1972 by merging four old districts ( OsnabrÃ 1\/4 ck , Melle , BersenbrÃ 1\/4 ck , Wittlage ) .