Complex sentence: It was the final novel, under any banner, which featured the Seventh Doctor as the "current" Doctor, although McGann's Eighth Doctor had already made his televised appearance by the time the novel was published.
Split into simpler sentences: It was the final novel, under any banner, which featured the Seventh Doctor as the "current" Doctor. This was anachronistic, however, as McGann's Eighth Doctor had already made his televised appearance by the time the novel was published.