Complex sentence: Unbeknownst to Sir William, Vic and Pol used a net to catch her mid-fall; the same technique is used to save Yoko after she's drugged and thrown down the same crevasse.
Split into simpler sentences: Unbeknownst to Sir William, Vic and Pol used a net to catch her mid-fall. The same technique is used to save Yoko after she's drugged and thrown down the same crevasse.