Complex sentence: Once there, the caller confirms the identity of all the four men via a conference call with Arif and Maraar, and then asks Arif and Sethu to unlock their handcuffs and leave them alone at a particular spot.
Split into simpler sentences: Once there, the caller confirms the identity of the four men via a conference call with Arif and Maraar. He then asks Arif and Sethu to unlock their handcuffs and leave them alone at a particular spot.