Complex sentence: Redpills appear to have either seen "glitches" within the Matrix (e.g. a book continuously reappearing on a shelf, regardless of attempts to remove the book), or question their lives within the Matrix, refusing to dismiss strange events.
Split into simpler sentences: Redpills appear to have either seen "glitches" within the Matrix (e.g. a book continuously reappearing on a shelf, regardless of attempts to remove the book). Their appearance causes some to question their lives within the Matrix, refusing to dismiss strange events.