Complex sentence: Eventually, Coleye consumes the piece of Nerplex, left by Neenert before take-off, which turns him into an alien himself, his actions getting him captured by his own organization as Martin and Neenert lift-off into the skies.
Split into simpler sentences: Eventually, Coleye consumes the piece of nerplex, left by Neenert before take-off, which turns him into an alien himself. His actions end up getting him captured by his own organization as Martin and Neenert lift-off into the skies.