Complex sentence: Hopper set aside her longtime feud with her archrival Harriet's mother Louella Parsons, and criticised RKO for taking properties away from a female producer to give to a male.
Split into simpler sentences: Hopper set aside her longtime feud with her archrival Louella Parsons, Harriet's mother. Hopper criticized RKO for taking the rights away from a female producer to give to a male.