Complex sentence: Winters had privately held concerns over Sobel's ability to lead the company in combat for some time before this and many of the enlisted men in the company had come to respect Winters for his competence and had also developed their own concerns about Sobel's leadership.
Split into simpler sentences: Winters had privately held concerns over Sobel's ability to lead the company in combat for some time before this. Many of the enlisted men in the company had come to respect Winters for his competence and had also developed their own concerns about Sobel's leadership.