Complex sentence: His paternal grandparents are Ozzie Nelson and wife Harriet Hilliard from the popular TV show Ozzie and Harriet and his maternal grandparents are football player and sports broadcaster Tom Harmon and the 1940s "B" movie actress Elyse Knox.
Split into simpler sentences: His paternal grandparents are Ozzie Nelson and Harriet Hilliard from the long running TV series Ozzie and Harriet. His maternal grandparents are football player and sports broadcaster Tom Harmon and the 1940s "B" movie actress Elyse Knox.