Complex sentence: At least with older game you can see the delay and can compensate for it by adjusting your aim ahead of the target more, in newer game you just don't get any hits hence the new term "hit detection".
Split into simpler sentences: At least with older games you can see the delay and compensate for it by adjusting your aim ahead of the target more. In newer games you just don't get any hits hence the new term "hit detection".