Complex sentence: John Ono Lennon II was the unborn baby of John Lennon and Yoko Ono, miscarried by Ono on November 21 of that year.
Split into simpler sentences: John Ono Lennon II is the name that was given to a fetus conceived by John Lennon and Yoko Ono. Ono miscarried by November 21 of that year.