Complex sentence: On Monday, November 27,2017, an unnamed female on NBC staff complained to the network's human resources department alleging that Lauer sexually harassed her during the 2014 Winter Olympics in Sochi, Russia, and that the harassment continued after they returned to New York.
Split into simpler sentences: On Monday, November 27,2017, an unnamed female NBC employee complained to the network's human resources department. She alleged that Lauer had sexually harassed her during the 2014 Winter Olympics in Sochi, Russia, and that the harassment continued after they returned to New York.