Complex sentence: The Black Knight interrupts Arthur's prayer of thanks for his victory by kicking him in the side of the head and accusing him of cowardice; when Arthur points out his injuries he insists "it's just a flesh wound!".
Split into simpler sentences: The Black Knight interrupts Arthur's prayer of thanks for his victory by kicking him in the side of the head and accusing him of cowardice. When Arthur points out the Black Knight's injuries, the Knight insists "it's just a flesh wound!".