Complex sentence: On 19 August 1993, Dutta felt pain in the chest and suffered a massive heart attack immediately after he returned home from the S.S.K.M hospital, Calcutta, West Bengal where he had undergone dialysis.
Split into simpler sentences: On 19 August 1993, Dutta felt pain in the chest and suffered a massive heart attack. Immediately after he returned home from the S.S.K.M hospital, Calcutta, West Bengal where he had undergone dialysis.