Complex sentence: Kim and Nick appear at the killer's side who is revealed to be Alex, who is Robin's twin, tearfully tells his sister that Jude, Kelly, Wendy and Nick were responsible for their sister's death.
Split into simpler sentences: Kim and Nick appear at the killer's side who is revealed to be Alex, who is Robin's twin. He tearfully tells his sister that Jude, Kelly, Wendy and Nick were responsible for their sister's death.