Complex sentence: Hershel Greene, Shawn Greene and Glenn Rhee, three characters from the comic series, have appeared briefly in "Season One", Glenn from the TV show as well with Michonne, who is featured as the playable-character in the "Michonne" mini-series.
Split into simpler sentences: Hershel Greene, Shawn Greene and Glenn Rhee, three characters from the comic series, have appeared briefly in "Season One", Glenn from the TV show as well. And Michonne is featured as the playable-character in the "Michonne" mini-series.