Complex sentence: A swarm of earthquakes of average magnitude 1.5 up to M3 began at 3am on 16 August 2014 generating 1600 earthquakes, there were "Very strong indications of ongoing magma movement, in connection with dyke intrusion" according to the Icelandic Metrological Office.
Split into simpler sentences: A swarm of earthquakes of average magnitude 1.5 up to M3 began at 03:00 on 16 August 2014, generating 1600 earthquakes. There were "Very strong indications of ongoing magma movement, in connection with dyke intrusion" according to the Icelandic Metrological Office.