Simplify the following text for a Grade 9 native English-speaking person.
Original: The area of the district OsnabrÃ 1\/4 ck has been confessionally mixed since Protestant Reformation and the Peace of Westphalia : Lutherans ( Evangelical Lutheran State Church of Hanover ) and Catholics ( Roman Catholic Diocese of OsnabrÃ 1\/4 ck ) .
Simplified: When the clerical states of Germany were dissolved , OsnabrÃ 1\/4 ck became part of the Kingdom of Hanover , which in turn fell to Prussia in 1866 . The district was established in 1972 by merging four old districts ( OsnabrÃ 1\/4 ck , Melle , BersenbrÃ 1\/4 ck , Wittlage ) .