Complex sentence: Napoleon had set his hopes on ending the campaign victoriously, but the loss of Moscow did not compel Alexander I to sue for peace, and both sides were aware that Napoleon's position grew worse with each passing day.
Split into simpler sentences: Napoleon had set his hopes on ending the campaign victoriously, but victory in the field did not yield him a victory in the war. The loss of Moscow did not compel Alexander I to sue for peace, and both sides were aware that Napoleon's position grew worse with each passing day.