Complex sentence: In the Yokohama District, Opera Kobayashi runs a detective agency, Milky Holmes, staffed by four aspiring young girl detectives who attend the Holmes Detective Academy, and each girl possesses their own unique Toy.
Split into simpler sentences: In the Yokohama District, Opera Kobayashi runs a detective agency named Milky Holmes. It is staffed by four aspiring young girl detectives who attend the Holmes Detective Academy, and each girl possesses their own unique Toy.