Complex sentence: In both Giles's and Buffy's dreams, a negative image is used when Buffy puts mud on her face, because Whedon felt it looked really interesting and strange, but also because the scene did not come out as primal as he had hoped.
Split into simpler sentences: In both Giles and Buffy's dream, a negative image is used when Buffy puts mud on her face. Reasoning for that is because Whedon felt it looked really interesting and strange, but also because the scene did not come out as primal as he had hoped.