Complex sentence: Since 2005 the paper has been cooperating with "The New York Times" and has published "The New York Times International Weekly" on Mondays which is a six-page supplement featuring selected English language articles from "the Times".
Split into simpler sentences: Since 2005 the paper has published "The New York Times International Weekly" on Mondays. It is a six-page supplement featuring selected English language articles from "The New York Times".