Complex sentence: Vanderbilt's line underperformed, even matched by the line play of the Normal team, as shown by how all of the Commodores touchdowns were scored by end runs and forward passes.
Split into simpler sentences: Vanderbilt's line play was underwhelming, even matched by the line play of the Normal team. This could be shown by how all of the Commodores' touchdowns were scored by end runs and forward passes.