Complex sentence: Saint Pierre led this envoy of emaciated volunteers to the city gates and it is this moment and this poignant mix of defeat, heroic self-sacrifice and the facing of imminent death that Rodin captures in these figures, which are scaled somewhat larger than life.
Split into simpler sentences: Saint Pierre led this envoy of emaciated volunteers to the city gates. It was this moment, and this poignant mix of defeat, heroic self-sacrifice, and willingness to face imminent death that Rodin captured in his sculpture, scaled somewhat larger than life.