Complex sentence: When a servant (Desmond Llewellyn) opens the door to the beggar, he warns him to leave, but it is too late-the Marques has already seen the beggar and invites him in.
Split into simpler sentences: When a servant (Desmond Llewellyn) opens the door to the beggar, he warns him to leave. But it is too late: the Marques has already seen the beggar and invites him in.