Complex sentence: Thirdly, the Central Government's decision to declare the Scheduled Tribes status upon Gurjars of Jammu and Kashmir, is historic milestone which was indeed Sarwari Kasana's brain child notwithstanding the fact that so many other personalities had put in their efforts in this regard.
Split into simpler sentences: Thirdly, the Central Government's decision to declare the Scheduled Tribes status upon Gurjars of Jammu and Kashmir, is hailed as a historic milestone. It was indeed Sarwari Kasana's brain child notwithstanding the fact that so many other personalities had put in their efforts in this regard.