Complex sentence: The sword was replaced in its scabbard by either Churchill or Stalin and at the end of the ceremony Stalin unexpectedly handed it off to one of his oldest and most loyal comrades, Marshal Kliment Voroshilov.
Split into simpler sentences: The sword was replaced in its scabbard by either Churchill or Stalin. At the end of the ceremony, Stalin unexpectedly handed it off to one of his oldest and most loyal comrades, Marshal Kliment Voroshilov.