Complex sentence: This led Perdy to think she was losing her mind-Rosemary wanted Perdy out of her and Grayson's lives for good, deciding she wasn't good enough for Grayson if she couldn't have children.
Split into simpler sentences: This led Perdy to think she was losing her mind-Rosemary planned to get Perdy out of her and Grayson's lives for good. Rosemary had decided she wasn't good enough to be Grayson's wife if she couldn't have children.