Metropolitan Borough of Doncaster
The borough was created on 1 April 1974 , under the Local Government Act 1972 , as a merger of the former county borough of Doncaster along with the urban districts of Adwick le Street , Bentley with Arksey , Conisbrough , Mexborough , Tickhill along with Doncaster Rural District and Thorne Rural District , the parish of Finningley from East Retford Rural District and small parts of the parish of Harworth from Worksop Rural District from Nottinghamshire . 
<triplet> Bentley with Arksey <subj> urban district <obj> instance of