Complex sentence: In 2002 when the report on the Dutch involvement in the Srebrenica massacre was published, it became clear that the Dutchbat peacekeeping force had been unable to prevent the massacre.
Split into simpler sentences: In 2002 when the raport on the Dutch involvement in the Srebrenica massacre was published. It became clear that the Dutchbat peacekeeping force had been unable to prevent the massacre.