Complex sentence: A month later at SummerSlam, Michaels was scripted to announce his retirement from professional wrestling, though the staged rivalry between Jericho and himself continued after Jericho punched Michaels' wife in the face.
Split into simpler sentences: A month later at SummerSlam, Michaels announced his retirement from professional wrestling. That night, Jericho punched Michaels' wife in the face.