Complex sentence: Problems arise here and there, but none like that of the Satin Slayer, a serial killer murdering the women of Fusion, a cosmetics company run by Kendall and her friends who helped to define it.
Split into simpler sentences: Problems arise here and there, but none like that of the Satin Slayer. A serial killer called the Satin Slayer is murdering the women of Fusion, a cosmetics company run by Kendall and her friends who helped to define it.