Complex sentence: Afterwards, in an elaborately prepared report to Himmler, now referred to as "The Stroop Report", he boasted that "the Warsaw Ghetto is no more;" this report would later be used as evidence at the Nuremberg Trials.
Split into simpler sentences: Afterwards, in an elaborately prepared report to Himmler, now referred to as "The Stroop Report", he boasted that "the Warsaw Ghetto is no more". This report would later be used as evidence at the Nuremberg Trials.