Complex sentence: One witness to the events of 25 August said that no less than seven tanks approached Novoazovsk and started shooting, at which point residents hid in their homes, and explosions and rumbling could be heard.
Split into simpler sentences: One witness to the events of 25 August said that no less than seven tanks approached Novoazovsk and started shooting. After that, residents hid in their homes, and explosions and rumbling could be heard.