Complex sentence: The revolt was further hampered when its nominal leader, Prince Sergei Petrovich Trubetskoy, suffered a last-minute change of heart and chose to hide in the Austrian Embassy during the confrontation.
Split into simpler sentences: The revolt was further hampered when its nominal leader, Prince Sergei Petrovich Trubetskoy, suffered a last minute change of heart. Instead of joining the revolt, Trubetskoy chose to hide in the Austrian Embassy during the confrontation.