reorganisation

nouns

an extensive alteration of the structure of a corporation or government
"after the takeover there was a thorough reorganization"; "the reorganization was prescribed by federal bankruptcy laws"
reorganisation, reorganization
the imposition of a new organization; organizing differently (often involving extensive and drastic changes)
"a committee was appointed to oversee the reorganization of the curriculum"; "top officials were forced out in the cabinet shakeup"
reorganisation, reorganization, shake-up, shakeup