Original sentence: In an interview with The Guardian, Dale Hoiberg, the editor-in-chief of Encyclopædia Britannica, noted that "people write of things they're interested in, and so many subjects don't get covered; and news events get covered in great detail
Edited sentence: In an interview with The Guardian, the editor-in-chief of Encyclopædia Britannica (which, in its most complete form contains some 120,000 articles as of 2004) noted that "people write of things they're interested in, and so many subjects don't get covered (The English Wikipedia currently has  articles); and news events get covered in great detail