Complex sentence: Therefore these signals will show the same lights indicated by the Lower Quadrant Semaphore Distant and two-arm signals, that is, two greens for Clear, a green over a red for Caution and two reds for Stop.
Split into simpler sentences: Therefore these signals will show the same lights indicated by the Lower Quadrant Semaphore Distant and two-arm signals. That is two greens for Clear, a green over a red for Caution and two reds for Stop.