Complex sentence: Eventually, the crew decides Dubois is no longer needed, but before he can be killed, the pirate ship is attacked and boarded by a mercenary Englishman, Lord Edgar Dobbs (Roger Moore).
Split into simpler sentences: Eventually, the crew decides Dubois is no longer needed. But before he can be killed, the pirate ship is attacked and boarded by a mercenary Englishman, Lord Edgar Dobbs (Roger Moore).