Complex sentence: Rescuers heard knocking and voices right up to the seventh day after the collapse, but only three people, including an infant, were pulled out from the rubble alive, and only within the first 24 hours.
Split into simpler sentences: Rescuers heard knocking and voices right up to the seventh day after the collapse. Only three people, including an infant, were pulled out from the rubble alive, and only within the first 24 hours.