Complex sentence: On night of 27 April, Robb and Arnoud van den Berg played a recording of the calls, and a second owl responded, they came within 40m of the owl which was shaped like a strix.
Split into simpler sentences: On night of 27 April, Robb and Arnoud van den Berg played a recording of the calls, and a second owl responded. They came within 40m of the owl which was shaped like a Strix.