Complex sentence: On July 17,2014,a Malaysian airline MH-17 was shot down over Ukraine, leaders of the rebel Donetsk People's Republic denied any involvement, the same day and the same hour they reported their forces had downed a much smaller Ukrainian transport plane.
Split into simpler sentences: On July 17,2014, a Malaysian airline MH-17 was shot down over Ukraine. Leaders of the rebel Donetsk People's Republic denied any involvement, on the same day and the same hour they reported their forces had downed a much smaller Ukrainian transport plane.