Complex sentence: After gaining strength, John ends up at a veterinary clinic to treat his wound before taking a dog out from one of the cages for a walk on the boardwalk, where he had his last date with Helen.
Split into simpler sentences: After gaining strength, John ends up at a veterinary clinic where he attempts to treat his wound. He then takes a dog out from one of the cages for a walk on the boardwalk, where he had his last date with Helen.