Complex sentence: The plot of "Forged Alliance" begins place immediately after the events of Supreme Commander, and is depicted using a time line cut scene showing the events between the end of Supreme Commander, and the first mission of Forged Alliance.
Split into simpler sentences: The plot of "Forged Alliance" takes place immediately after the events of Supreme Commander. A time line cut scene depicts the events between the end of Supreme Commander and the first mission of Forged Alliance.