Complex sentence: The character of Audrey Roberts was created as the mother of established character Gail Platt, after initially appearing on and off within the show for 6 years as a background character she was made a permanent addition to the core cast in 1985.
Split into simpler sentences: The character of Audrey Roberts was created as the mother of established character Gail Platt. After appearing as an occasional character for several years, she became a permanent addition to the core cast in 1985.