Complex sentence: With Zak working as gamekeeper, they became good friends and soon Lisa Dingle suspected they were having an affair, especially when Rosemary told Zak her first husband committed suicide because Rosemary made his life hell.
Split into simpler sentences: With Zak working as gamekeeper, they became good friends and soon Lisa Dingle suspected they were having an affair. This wasn't helped when Rosemary told Zak her first husband committed suicide because she made his life hell.