Complex sentence: The book also claims that Lisa used to have a normal hairstyle that was changed after Homer cut it which has been strongly disproven by flashback scenes showing Lisa as a baby (with her spikes) and her as a young child.
Split into simpler sentences: The book also states that Lisa used to have a normal hairstyle that was changed after Homer cut it. This conflicts with flashback scenes showing Lisa as a baby (with her spikes) and her as a young child.