Complex sentence: Vanderbilt coaches expected more from their attempted line plunges and were concerned by the weak showing of the line which needed to improve if Vanderbilt was to have confidence in the mid-season, and in particular against Michigan.
Split into simpler sentences: Vanderbilt coaches expected more from their attempted line plunges and were concerned by the weak showing of the line. More was needed if Vanderbilt was to have confidence in the mid-season, and in particular against Michigan.