Complex sentence: Redon, despite the many beards, is clearly the respected elder figure of the group, set somewhat apart from the rest and we can infer from Sérusier's pose that he is explaining to Redon why the Nabis admire Cézanne.
Split into simpler sentences: Redon, despite the many beards, is clearly the respected elder figure of the group, set somewhat apart from the rest. We can infer from Sérusier's pose that he is explaining to Redon why the Nabis admire Cézanne.