Complex sentence: LexCorp (originally styled Lexcorp) is a fictional company founded by Lex Luthor in the DC Comics "Superman" series, first canonically appearing in John Byrne's "The Man of Steel".
Split into simpler sentences: LexCorp (originally styled Lexcorp) is a fictional company appearing in American comic books published by DC Comics. It first canonically appeared in John Byrne's "The Man of Steel".