Complex sentence: On 15 August 2015, Turkish news media reported that six MiG-31s had been delivered to the Syrian Arab Air Force, but Russia denied making MiG-31 deliveries to Syria.
Split into simpler sentences: On 15 August 2015, Turkish news media reported that six MiG-31s had been delivered to the Syrian Arab Air Force. However, Russia denied making MiG-31 deliveries to Syria.