Complex sentence: However, Stéphane catches up with Said and warns him not to go back to the hotel, but Saïd drags Stéphane with him and they are both shot dead.
Split into simpler sentences: However, Stéphane catches up with Saïd and warns him not to go back to the hotel. Saïd, however, drags Stéphane with him and they are both shot dead.