Complex sentence: After Sekigahara the Eastern Army began to march toward their doorstep, she faced them while wearing armor at the Siege of Yanagawa and protected the rearguard of Muneshige.
Split into simpler sentences: After Sekigahara the Eastern Army began to march toward their doorstep. She faced them while wearing armor at the Siege of Yanagawa and protected the rearguard of Muneshige.