Complex sentence: Corliss is both elated by the total power he held over the soldier and disgusted by a display of terror he considers weak and unmanly, and made up his mind right then and there to never show anyone any sign of vulnerability.
Split into simpler sentences: Corliss is both elated by the total power he held over the soldier and disgusted by a display of terror he considers weak and unmanly. He makes up his mind then and there to never show any sign of vulnerability.