Complex sentence: The first two are based in the continuity of the Virgin New Adventures and feature Sylvester McCoy as the Doctor and Sophie Aldred as Ace, while the latter is a set of four one episode stories starring Paul McGann's Doctor.
Split into simpler sentences: The first two are based in the continuity of the Virgin New Adventures and feature Sylvester McCoy as the Doctor and Sophie Aldred as Ace. The latter is a set of four one episode stories starring Paul McGann's Doctor.