Complex sentence: Mary Courtney Kennedy Hill (known as Courtney, born September 9,1956 in Boston, Massachusetts), is the fifth of the eleven children of Robert Francis Kennedy and Ethel Skakel.
Split into simpler sentences: Mary Courtney Kennedy Hill (known as Courtney) was born on September 9,1956 in Boston, Massachusetts. She is the fifth of the eleven children of Robert Francis Kennedy and Ethel Skakel.