Complex sentence: Human Rights Watch and "The Guardian" both criticized the investigation, which the IDF, while maintaining it was not responsible for the blast, later admitted was flawed, while the German newspaper "Süddeutsche Zeitung" questioned the reliability of the video footage.
Split into simpler sentences: Human Rights Watch and "The Guardian" both criticized the investigation, which the IDF, while maintaining it was not responsible for the blast, later admitted was flawed. The German newspaper "Süddeutsche Zeitung" questioned the reliability of the video footage.