Complex sentence: His better known works can be characterised by fantastical elements that tended towards the hallucinatory that may draw from the hellscape in van Eyck's "Crucifixion and Last Judgement diptych" but are independent at the same time.
Split into simpler sentences: His better known works can be characterised by fantastical elements that tended towards the hallucinatory. These may draw from the hellscape in van Eyck's "Crucifixion and Last Judgement diptych", but are independent at the same time.