Complex sentence: The greatly elongated feet provide enormous leverage for the strong legs, but the famous kangaroo hop has more: kangaroos and wallabies have a unique ability to store elastic strain energy in their tendons.
Split into simpler sentences: The greatly elongated feet provide enormous leverage for the strong legs. But there is more to the famous kangaroo hop: kangaroos and wallabies have a unique ability to store elastic strain energy in their tendons.