Complex sentence: A rescue dog, Heiko, amply proved the value dogs have in avalanche rescue, saving many lives, and another dog that was a Labrador-Alsatian cross named Jack that was buried under snow for 24 hours.
Split into simpler sentences: A rescue dog, Heiko, amply proved the value dogs have in avalanche rescue, saving many lives. Also a other dog that was a Labrador-Alsatian cross named Jack that was buried under snow for 24 hours.