Original sentence: Patty Duke was considered for the lead (she would play the role of Rosemary during a brief sequence at the beginning of the TV movie Look What's Happened to Rosemary's Baby (1976), in which Ruth Gordon was the only actor to reprise her role from the 1968 movie)
Edited sentence: Patty Duke was considered for the lead (and ironically, would play the role of Rosemary during a brief sequence at the beginning of the TV movie Look What's Happened to Rosemary's Baby (1976), in which Ruth Gordon was the only actor to reprise her role from the 1968 movie)