Complex sentence: DiDio joined DC comics in January, 2002, as Vice President-Editorial, as well as writer for Superboy (issues 94 to 100); and was promoted to Vice President-Executive Editor, DC Universe in October, 2004.
Split into simpler sentences: DiDio joined DC comics in January, 2002, as Vice President-Editorial, as well as writer for Superboy (issues 94 to 100). He was promoted to Vice President-Executive Editor, DC Universe in October, 2004.