Complex sentence: Afterwards, she starred in her breakout role as Gertie in Steven Spielberg's "E.T. the Extra-Terrestrial" and quickly became one of Hollywood's most recognized child actresses, going on to establish herself in mainly comic roles.
Split into simpler sentences: Afterwards, she starred in her breakout role as Gertie in Steven Spielberg's "E.T. the Extra-Terrestrial". She quickly became one of Hollywood's most recognized child actresses, going on to establish herself in mainly comic roles.