If you think Toni Morrison is difficult to read, try Virginia Woolf. They are challenging in different ways. Toni Morrison speaks in metaphors that diversifies the main plot into layers of allusions and meanings, creating a prose so poetic and lush that you will read on for pages until you realize the story has been lost. Virginia Woolf delights in the stream of consciousness. The narration follows at least twenty characters in a way that Woolf blurs the direct and indirect speech. An example from my current reading, Mrs. Dalloway:
Anyhow they were inseparable, and Elizabeth, her own daughter, went to Communion; and how she dressed, how she treated people who came to lunch she did not care a bit, it being her experience that the religious ecstasy made people callous (so did causes); dulled their feelings, for Miss Kilman would do anything for the Russians, starved herself for the Austrians, but in private inflicted positive torture, so insensitive was she, dressed in a green macintosh coat. Year in year out she wore that coat; she perspired; she was never in the room five minutes without making you feel her superiority, your inferiority; how poor she was; how rich you were; how she lived in a slum without a cushion or a bed or a rug or whatever it might be, all her soul rusted with that grievance sticking in it, her dismissal from school during the War—poor embittered unfortunate creature! For it was not her one hated but the idea of her, which undoubtedly had gathered in to itself a great deal that was not Miss Kilman had become one of those spectres with which one battles in the night; one of those spectres who stand astride us and suck half our life-blood, dominators and tyrants; for no doubt with another throw of the dice, had the black been uppermost and not the white, she would have loved Miss Kilman! But not in this world. No.” 
Every scene tracks the momentary thoughts of the character, as if the camera is panning slowly across the scene in a film. The semi-colons galore slow down the reading, forcing you to re-read, to examine closer, and to discern the many independent clauses buried in her long sentences. At times reading can become suffocating. The above paragraph encompasses just one thought, and in times, I cannot help asking, when is this paragraph going to end, so I can have another sip of my coffee? I have thoughts that some of the most minute, mundane details aren’t even important, if not irrelevant to the main storyline. It’s no more than a demonstration of her unique style. More to come later.