Complex sentence: On the sailboat, Sun, her husband Jin, and Sayid, seeing that Jack, Sawyer and Kate have not responded to their signal fire, realize they may have been captured, and wants to sail clear of the mountains and start another one.
Split into simpler sentences: On the sailboat, Sun, her husband Jin, and Sayid, seeing that Jack, Sawyer and Kate have not responded to their signal fire, realize they may have been captured. Sayid wants to sail clear of the mountains and start another one.