Complex sentence: On Saturday April 15,1978 Tallman was making a routine ferry flight in a twin engine Piper Aztec from Santa Monica Airport (California) to Phoenix, Arizona under visual flight rules when he continued the flight into deteriorating weather, a lowering ceiling and rain.
Split into simpler sentences: On Saturday April 15,1978, Tallman was making a routine ferry flight of a twin engine Piper Aztec from Santa Monica Airport, California to Phoenix, Arizona under visual flight rules. He continued the flight into deteriorating weather, a lowering ceiling and rain.