Complex sentence: In the hallucination, Oliver finds himself back at Queen Manor, having never gotten on "The Queen's Gambit", where he is about to be married to Laurel Lance, both his parents are alive, and Diggle is the Hood.
Split into simpler sentences: In the hallucination, they find Oliver back at Queen Manor, having never gotten on "The Queen's Gambit", where he is about to be married to Laurel Lance. Both of his parents are alive, and Diggle is the Hood.