Complex sentence: Mary Jean Adair, one of the survivors, died of a heart attack eight weeks after the crash; she was included in a dedication to the people killed by the crash in a memorial service at an elementary school gymnasium some years later.
Split into simpler sentences: Mary Jean Adair, one of the survivors, died of a heart attack eight weeks after the crash. She was included in a dedication to the people killed by the crash in a memorial service at an elementary school gymnasium some years later.