Original: Thorne succeeds Dan Shulman, who had called play-by-play for the network since 2002; Shulman, in turn, had been preceded by Charley Steiner from 1998 2002.
Simplified: Thorne succeeded Dan Shulman, who had called for the network since 2002; Shulman, in turn, had been preceded by Charley Steiner from 1998-2002.