Complex sentence: In Poldark, with'sentence' passed, as the'guilty' man (who professes his genuine guilt) is taken away, the viewer sees that the wick in the candle had been pre-cut, and the flame would have naturally extinguished anyway.
Split into simpler sentences: In Poldark, with'sentence' passed, the'guilty' man who professes his (genuine) guilt. As he is taken away, the viewer sees that the wick in the candle had been pre-cut, and the flame would have naturally extinguished anyway.