Complex sentence: V. Vidyarnthan "alias" Vidya "alias" Nidhi "alias" Mike was the most important of them, having been abducted on 16 January 2002, and killed after being subjected to torture and intense interrogation for four days.
Split into simpler sentences: V. Vidyarnthan "alias" Vidya "alias" Nidhi "alias" Mike was the most important person out of them. He was killed after being subjected to torture and intense interrogation for four days.