Complex sentence: He succumbed to his injuries at General Hospital, Madras on March 28,1943: two years before the end of WWII (August 15 1945) and four years before India's Independence (August 15 1947).
Split into simpler sentences: He succumbed to his injuries at General Hospital, Madras on March 28,1943. Two years before the end of WWII (August 15,1945) and four years before India's Independence (Aug 15th 1947).