Complex sentence: Inferno has often been cited as proof of Strindberg's own personal neuroses, such as a persecution complex, but evidence also suggests that Strindberg, although experiencing mild neurotic symptoms, both invented and exaggerated much of the material in the book for dramatic effect.
Split into simpler sentences: Inferno has often been cited as proof of Strindberg's own personal neuroses, such as a persecution complex. But there is also evidence to suggest that Strindberg, although experiencing mild neurotic symptoms, both invented and exaggerated much of the material in the book for dramatic effect.