Complex sentence: Fellow biographer Benoît Peeters thought that it exhibited "a political maturity" and an "originality" and that Hergé is able to break free from the "narrative limits (of)... too much realism" by the use of Syldavia as a setting.
Split into simpler sentences: Fellow biographer Benoît Peeters thought that it exhibited "a political maturity" and "originality". Further, he felt that Hergé was able to break free from the "narrative limits (of)... too much realism" by the use of Syldavia as a setting.