Complex sentence: Among the books he illustrated were the poems of Oscar Wilde and Charles Baudelaire, but also erotic classic authors such as Aristophanes, Ovid, Strato and Apuleius.
Split into simpler sentences: Among the books he illustrated were the poems of Oscar Wilde and Charles Baudelaire. He also illustrated erotic classics by Aristophanes, Ovid, Strato and Apuleius.