Complex sentence: In a later episode, her daughter becomes terminally ill. Neither Horatio nor Susie are matches for a bone marrow transplant, but he convinces Yelina Salas (who had assumed Madison was Horatio's daughter before Horatio told her about Ray), to have her son tested.
Split into simpler sentences: In a later episode, Madison becomes terminally ill. Neither Horatio nor Susie are matches for a bone marrow transplant. Horatio convinces Yelina Salas (who had assumed Madison was Horatio's daughter before Horatio told her the truth) to have her son tested.