Complex sentence: Octave is also the only of the four characters inspired by the play that also shares character traits with its counterpart: in both Octave is a "sad clown" full of self-doubt and self-pity.
Split into simpler sentences: Octave is also the only of the four characters inspired by the play that shares traits with its counterpart. In both works Octave is a "sad clown" full of self-doubt and self-pity.