Complex sentence: Firstly, the sheer difficulty of the text itself, which has baffled all but the most determined readers, for stylistically, the discourse abruptly alternates between notebook jottings to passages of sublime purple prose.
Split into simpler sentences: Firstly, the sheer difficulty of the text itself, which has baffled all but the most determined readers. Stylistically, the discourse abruptly veers from notebook jottings to passages of sublime purple prose.