Original sentence: Darjeeling is a city and a municipality in the Indian state of West Bengal.The varied culture of the town reflects its diverse demographic milieu comprising Lepcha, Khampa, Gorkha, Newar, Sherpa, Bhutia, Bengali and other mainland Indian ethno-linguistic groups
Edited sentence: Darjeeling is a city and a municipality in the Indian state of Gorkhaland region of West Bengal.The varied culture of the town reflects its diverse demographic milieu comprising Lepcha, Khampa,  Limbu Kirati Gorkha, Newar, Sherpa, Bhutia, Bengali and other mainland Indian ethno-linguistic groups