Complex sentence: Then, in the early hours of 7 April 2017, the two flagged down a driver, Sankalpa Mahatara, 20, who took them for youths in need of assistance, and bashed him with a hammer and stabbed him in the stomach with a steak knife.
Split into simpler sentences: Then, in the early hours of 7 April 2017, the two flagged down a driver, who took them for youths in need of assistance. They bashed him with a hammer and stabbed him in the stomach with a steak knife.