Complex sentence: On Simchat Torah, when hundreds of singing and dancing students escorted Rabbi Scheinberg home from the yeshiva after services, she would watch from their fifth-floor apartment; when he came upstairs, he said, Did you see that ?
Split into simpler sentences: On Simchat Torah, when hundreds of singing and dancing students escorted Rabbi Scheinberg home from the yeshiva after services, she would look on from their fifth-floor apartment. When he came upstairs, he would say to her, Did you see that?