Complex sentence: Inspiration came from old hotel horror films and actual hotels situated at downtown Los Angeles, with reputation of sinister events, including The Cecil in Los Angeles, where the death of 21-year-old Canadian student Elisa Lam occurred.
Split into simpler sentences: Inspiration came from old hotel horror films and actual hotels situated at downtown Los Angeles, with reputation of sinister events. This included The Cecil in Los Angeles, where the death of 21-year-old Canadian student Elisa Lam occurred.