Complex sentence: Currently she is most well known to American comic readers as the cover artist of "Runaways" and Joss Whedon's current "Buffy the Vampire Slayer" "Season 8" comic published by Dark Horse.
Split into simpler sentences: Currently she is most well known to American comic readers as the cover artist of "Runaways". Chen illustrates the covers of Joss Whedon's current "Buffy the Vampire Slayer" "Season 8" comic for Dark Horse.