Complex sentence: Malaysia Airlines Flight 17, a Boeing 777-200ER--registered "9M-MRD"--en route to Kuala Lumpur, Malaysia, from Amsterdam, Netherlands, was shot down over Ukraine by Russian separatists All 283 passengers and 15 crew members aboard were killed.
Split into simpler sentences: Malaysia Airlines Flight 17, a Boeing 777-200ER--registered "9M-MRD"--en route to Kuala Lumpur, Malaysia, from Amsterdam, Netherlands, was shot down over Ukraine. By Russian separatists All 283 passengers and 15 crew members aboard were killed.