Complex sentence: Just when it seems like Grubbs will lose the fight, Beranabus, (the tramp that had been following him around Carcery Vale) appears, and the two jump from the plane, and fly to his cave.
Split into simpler sentences: Just when it seems like Grubbs will lose the fight. However, Beranabus, the tramp that had been following him around Carcery Vale, appears; and the two jump from the plane, and fly to his cave.