Complex sentence: During the fight, one of the goons gives him an injection, which makes him go unconscious in 3 minutes, but Kiran beats all the goons within 3 minutes and comes out of his guest house; by then Gauthami reaches there.
Split into simpler sentences: During the fight, one of the goons give him an injection which makes him go unconscious in 3 minutes. But Kiran beats all the goons within 3 minutes and comes out of his guest house, by then Gauthami reaches there.