Complex sentence: Curtis was nearly sixty years old, and age had taken a toll on his desire for combat; however, thanks to his aggressive subordinate Gen. Blunt, Curtis decided to make another stand south of Westport.
Split into simpler sentences: Curtis was nearly 60 years old and age had now taken a toll on his desire for combat. However thanks to his aggressive subordinate, Gen. Blunt, the decision was made to make another stand south of Westport.