Complex sentence: On the same day (31 January), Putnik's detachment chased the Ottoman army, which was retreating towards Bujanovac and Preševo, attacking parts of the army and causing panic among Turkish refugees who had retreated with it.
Split into simpler sentences: On the same day (31 January), Putnik's detachment chased the Ottoman army which was retreating towards Bujanovac and Preševo. The detachment attacked parts of the army and caused panic among Turkish refugees who had retreated with it.