Complex sentence: She tells him she thought she was going crazy and seeing ghosts and when Wu asks how she got over thinking it was real, she tells him that it didn't matter if it was real, what mattered was losing her fear of it.
Split into simpler sentences: She tells him she thought she was going crazy and seeing ghosts. When Wu asks how she got over thinking it was real, she tells him that it didn't matter whether it was real, what mattered was losing her fear of it.