Complex sentence: Rebecca was born off screen in Dallas between 1984 and 1989 the daughter of Cliff Barnes and Afton Cooper and is named after her aunt Pamela Barnes Ewing and grandmother Rebecca Barnes Wentworth.
Split into simpler sentences: Rebecca was born off-screen in Dallas in 1984, as the daughter of Cliff Barnes and Afton Cooper. Her full name is Pamela Rebecca, named after her aunt Pamela Barnes Ewing and grandmother Rebecca Barnes Wentworth.