Complex sentence: He is the son of actor Robert Coleby, who has guest starred in "All Saints" with his son and who played Rock Hudson in the telemovie, in which, coincidently, Conrad's "headLand" co-star Rachael Taylor also appeared.
Split into simpler sentences: He is the son of actor Robert Coleby, who has guest starred with his son on "All Saints". His father played Rock Hudson in the telemovie, in which, coincidentally, Conrad's "headLand" co-star Rachael Taylor also appeared.