Complex sentence: Although ringing up certainly involves some physical exertion, actual ringing should rely more on practised skill than mere brute force; after all, even the smallest bell to be encountered in a tower will be much heavier than the person ringing it.
Split into simpler sentences: Although ringing up certainly involves some physical exertion, actual ringing should rely more on practised skill than mere brute force. Even the smallest bell in a tower is much heavier than the person ringing it.