Complex sentence: He stated that the thin ice layer on the bodies of the girls indicated that their bodies must still have been warm when they were dumped there and a heavy snowfall on January 7,1957 should have buried the bodies in snow.
Split into simpler sentences: He stated that the thin ice layer on the bodies of the girls indicated that their bodies must still have been warm when they were dumped there. A January 7,1957 heavy snowfall should have buried the bodies in snow.